<?xml version="1.0" encoding="UTF-8" ?><!-- generator=Zoho Sites --><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:content="http://purl.org/rss/1.0/modules/content/"><channel><atom:link href="https://www.biotether.com/blogs/tag/covid-19/feed" rel="self" type="application/rss+xml"/><title>BioTether Sciences, Inc. - Blog ##COVID-19</title><description>BioTether Sciences, Inc. - Blog ##COVID-19</description><link>https://www.biotether.com/blogs/tag/covid-19</link><lastBuildDate>Tue, 04 Nov 2025 23:32:40 -0800</lastBuildDate><generator>http://zoho.com/sites/</generator><item><title><![CDATA[Will vaccinations against COVID cause safety and efficacy issues for biotherapeutics and gene therapies?]]></title><link>https://www.biotether.com/blogs/post/will-vaccinations-against-covid-cause-safety-and-efficacy-issues-for-biotherapeutics-and-gene-therap</link><description><![CDATA[Will vaccinations against COVID cause safety and efficacy concerns for biotherapeutics and gene therapies?]]></description><content:encoded><![CDATA[<div class="zpcontent-container blogpost-container "><div data-element-id="elm_fPPi6JR4QNCNuXS_fcM00Q" data-element-type="section" class="zpsection "><style type="text/css"></style><div class="zpcontainer-fluid zpcontainer"><div data-element-id="elm_W0iYaw0bTOuQ_kjPfABH3w" data-element-type="row" class="zprow zprow-container zpalign-items- zpjustify-content- " data-equal-column=""><style type="text/css"></style><div data-element-id="elm_CaZdgOcKTEeZ_CzJfbR_QA" data-element-type="column" class="zpelem-col zpcol-12 zpcol-md-12 zpcol-sm-12 zpalign-self- "><style type="text/css"> [data-element-id="elm_CaZdgOcKTEeZ_CzJfbR_QA"].zpelem-col{ border-radius:1px; } </style><div data-element-id="elm_i7xTPUeaRridezPNFX5DMA" data-element-type="heading" class="zpelement zpelem-heading "><style> [data-element-id="elm_i7xTPUeaRridezPNFX5DMA"].zpelem-heading { border-radius:1px; } </style><h2
 class="zpheading zpheading-align-center " data-editor="true">COVID Vaccinations&nbsp; and Antibodies&nbsp;</h2></div>
<div data-element-id="elm_TDU6gveDRgikENe-P0WzOg" data-element-type="text" class="zpelement zpelem-text "><style> [data-element-id="elm_TDU6gveDRgikENe-P0WzOg"].zpelem-text { border-radius:1px; } </style><div class="zptext zptext-align-center " data-editor="true"><br><span style="color:inherit;width:226px;"><img src="https://lh4.googleusercontent.com/CDnckxW8H6GMlyijfYnRVIRHfUJREjIBNR8bBBIfg0ZufqVCsKLFKIBDxXidkN6usZF62pal1eHgYLSSE-nfVWC1n2F4Tp_yT7ZfJl3gWO_zN9SjgC4WbJDBjIvl3B_6nbsZTA6I" width="226" height="150"></span><p style="color:inherit;text-align:left;"><span style="font-size:12pt;">COVID is a global health crisis, the virus infecting hundreds of millions and killing hundreds of thousands worldwide. The vaccines developed in rapid order may save millions of lives and are a wonder of modern science. But in rare instances the vaccines may cause safety issues due to undesirable responses to polyethylene glycol (PEG) and AdenoAssociated Virus (AAV). These immune responses to the vaccine nanoparticles or viral vectors could have implications beyond treating COVID and may prevent safe and efficacious delivery of life saving biotherapeutics and gene therapies. Are we immunizing hundreds of millions of people against PEGylated drugs and AAV gene therapies?&nbsp;</span></p><div style="text-align:left;"><br></div><p style="text-align:left;color:inherit;"><span style="font-size:12pt;">Both the Moderna and Pfizer COVID vaccines contain PEG in their formulations to create stable nanoparticles containing viral mRNA. PEG is a common additive in food, cosmetics and pharmaceuticals. PEG, when conjugated to protein therapeutics enhances pharmaceutical kinetics, pharmacodynamics and can reduce immunogenicity. However, people can and do create anti-PEG antibodies. According to a publication cited below, there is a 22 – 25% occurrence of anti-PEG in healthy blood donors, compared with a very low 0.2% occurrence two decades earlier. This increase may be due to an improvement of the limit of detection of antibodies during the years and to greater exposure to PEG and PEG-containing compounds. These results raise obvious concerns regarding the efficacy of PEG-conjugated drugs for a subset of patients. (</span><a href="https://www.tandfonline.com/doi/full/10.1517/17425247.2012.720969"><span style="font-size:12pt;">https://www.tandfonline.com/doi/full/10.1517/17425247.2012.720969</span></a><span style="font-size:12pt;">). Anti-PEG antibodies can cause skin rashes and more severe allergic responses, including anaphylaxis. Anti-PEG antibodies may cause rapid clearance, poor uptake and decreased efficacy of PEGylated biotherapeutics. There are over a dozen PEGylated biotherapeutics on the market for many diseases (see below and cited above). Will a significant number of people getting the COVID vaccine develop anti-PEG antibodies? Will COVID vaccination status need to be considered when prescribing PEGylated drugs?</span></p><div style="text-align:left;"><br></div><div style="text-align:left;"><br></div><div align="left" style="color:inherit;"><table><colgroup><col width="357"><col width="267"></colgroup><tbody><tr><td style="vertical-align:top;"><p style="text-align:center;"><span style="font-size:10pt;font-weight:700;">Conjugate</span></p></td><td style="vertical-align:top;"><p style="text-align:center;"><span style="font-size:10pt;font-weight:700;">Indication</span></p></td></tr><tr><td style="vertical-align:top;"><p style="text-align:center;"><span style="font-size:10pt;">PEG-adenosine deaminase (Adagen®)</span></p></td><td style="vertical-align:top;"><p style="text-align:center;"><span style="font-size:10pt;">SCID</span></p></td></tr><tr><td style="vertical-align:top;"><p style="text-align:center;"><span style="font-size:10pt;">PEG-asparaginase (Oncaspar®)</span></p></td><td style="vertical-align:top;"><p style="text-align:center;"><span style="font-size:10pt;">Leukemia</span></p></td></tr><tr><td style="vertical-align:top;"><p style="text-align:center;"><span style="font-size:10pt;">*PEG-IFN-α2b (PegIntron®)</span></p></td><td style="vertical-align:top;"><p style="text-align:center;"><span style="font-size:10pt;">Hepatitis C</span></p></td></tr><tr><td style="vertical-align:top;"><p style="text-align:center;"><span style="font-size:10pt;">*PEG-IFN-α2a (Pegasys®)</span></p></td><td style="vertical-align:top;"><p style="text-align:center;"><span style="font-size:10pt;">Hepatitis C</span></p></td></tr><tr><td style="vertical-align:top;"><p style="text-align:center;"><span style="font-size:10pt;">PEG-human growth hormone receptor antagonist (Somavert®)</span></p></td><td style="vertical-align:top;"><p style="text-align:center;"><span style="font-size:10pt;">Acromegaly</span></p></td></tr><tr><td style="vertical-align:top;"><p style="text-align:center;"><span style="font-size:10pt;">*PEG-G-CSF (Neulasta®)</span></p></td><td style="vertical-align:top;"><p style="text-align:center;"><span style="font-size:10pt;">Neutropenia</span></p></td></tr><tr><td style="vertical-align:top;"><p style="text-align:center;"><span style="font-size:10pt;">PEG-anti-VEGF aptamer (Pegaptanib, Macugen™)</span></p></td><td style="vertical-align:top;"><p style="text-align:center;"><span style="font-size:10pt;">Wet age-related macular degeneration</span></p></td></tr><tr><td style="vertical-align:top;" class="zp-selected-cell"><p style="text-align:center;"><span style="font-size:10pt;">PEG-erythropoietin analogs (Mircera®, Omontys®)</span></p></td><td style="vertical-align:top;"><p style="text-align:center;"><span style="font-size:10pt;">Anemia associated with chronic kidney disease</span></p></td></tr><tr><td style="vertical-align:top;"><p style="text-align:center;"><span style="font-size:10pt;">PEG-anti-TNF Fab′ (Cimzia®)</span></p></td><td style="vertical-align:top;"><p style="text-align:center;"><span style="font-size:10pt;">Rheumatoid arthritis and Crohn's disease</span></p></td></tr><tr><td style="vertical-align:top;"><p style="text-align:center;"><span style="font-size:10pt;">PEG-uricase (Pegloticase; Krystexxa®)</span></p></td><td style="vertical-align:top;"><p style="text-align:center;"><span style="font-size:10pt;">Chronic gout</span></p></td></tr><tr><td style="vertical-align:top;"><p style="text-align:center;"><span style="font-size:10pt;">PEG-liposome/doxorubicin (Doxil®/Caelyx®)</span></p></td><td style="vertical-align:top;"><p style="text-align:center;"><span style="font-size:10pt;">Cancer</span></p></td></tr></tbody></table></div><div style="text-align:left;"><br></div><p style="text-align:left;color:inherit;"><span style="font-size:12pt;">What about the impact of COVID vaccination on gene therapy drugs? Two adenoviral vector COVID-19 vaccines are now being used to protect people from COVID. The first, Ad5-nCoV from CanSino, uses a human adenovirus 5 (AAV5) vector; the second, AZD1222, licensed by AstraZeneca from University of Oxford, uses a chimpanzee adenovirus vector. At least seven adenovirus vector vaccines are in development for COVID-19. The AAV5 serotype, is used for gene therapy, and has double-digit pre-existing antibody prevalences that presents challenges to effective treatment.&nbsp; AAVs are used for the few approved gene therapies and many more in development. Gene therapy may be the future of medicine and save millions with rare genetic diseases. But now AAVs are being leveraged to strongly activate both B and T cells against COVID-19 (</span><a href="https://www.biocentury.com/article/305392/aav-covid-19-vaccine-aims-for-the-sweet-spot-between-antibody-and-t-cell-immunity"><span style="font-size:12pt;">https://www.biocentury.com/article/305392/aav-covid-19-vaccine-aims-for-the-sweet-spot-between-antibody-and-t-cell-immunity</span></a><span style="font-size:12pt;">). Will gene therapy developers need to find ways to avoid these antibodies and T-cells once hundreds of millions of people have been immunized against COVID? Pre-existing antibodies to certain AAV serotypes are common and sometimes neutralizing antibodies develop. These neutralizing antibodies can be tested in functional bioassays. Clever ways to engineer AAVs or reduce the immune response to the gene therapy are being explored. This may be increasingly important once millions of people are immunized with AAV-SARS-CoV-2.</span></p></div>
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</div></div></div></div></div></div> ]]></content:encoded><pubDate>Mon, 04 Jan 2021 13:24:38 -0800</pubDate></item><item><title><![CDATA[Contagion of COVID-19 Grants and Funding Opportunities]]></title><link>https://www.biotether.com/blogs/post/Contagion-of-COVID-19-Grants-and-Funding</link><description><![CDATA[<img align="left" hspace="5" src="https://www.biotether.com/Coronavirus 2.png"/>Hundreds of millions of dollars are available to small biotechnology and medical device businesses to fight COVID-19. The money is in the form of non- ]]></description><content:encoded><![CDATA[<div class="zpcontent-container blogpost-container "><div data-element-id="elm_N0-tQcj5SA6myOM95eFNGA" data-element-type="section" class="zpsection "><style type="text/css"></style><div class="zpcontainer-fluid zpcontainer"><div data-element-id="elm_H8MLa86fQj2nWBvI50w_Sg" data-element-type="row" class="zprow zprow-container zpalign-items- zpjustify-content- " data-equal-column=""><style type="text/css"></style><div data-element-id="elm_M6jAwRIPTFi6AJinOHrrqA" data-element-type="column" class="zpelem-col zpcol-12 zpcol-md-12 zpcol-sm-12 zpalign-self- "><style type="text/css"></style><div data-element-id="elm_BtBVaG94RniCmRL8_LWuSw" data-element-type="heading" class="zpelement zpelem-heading "><style> [data-element-id="elm_BtBVaG94RniCmRL8_LWuSw"].zpelem-heading { border-radius:1px; } </style><h2
 class="zpheading zpheading-align-center " data-editor="true"><span style="color:inherit;"><span style="font-size:11pt;">There is an outbreak of urgent funding opportunities for small biotechnology companies.</span></span></h2></div>
<div data-element-id="elm__0BYiFXNS7mOFv_tv0OBkQ" data-element-type="text" class="zpelement zpelem-text "><style> [data-element-id="elm__0BYiFXNS7mOFv_tv0OBkQ"].zpelem-text { border-radius:1px; } </style><div class="zptext zptext-align-left " data-editor="true"><p><span style="font-size:11pt;">Hundreds of millions of dollars are available to small biotechnology and medical device businesses to fight COVID-19. The money is in the form of non-dilutive grants, contracts,&nbsp; and also in exchange for equity positions in your company. For example start-up incubators may offer small seed funds of $25,000-$50,000 in exchange for residency, mentorship and an equity position in your company. Other funding includes large multi-year grants of $5,000,000 or more offered by the Department of Defense. The monies may bring forth the best and brightest ideas from biotechnology and medical device start-ups and other small businesses. These funded innovations could be critical in the fight against COVID-19 and other infectious diseases. The solutions to the current crisis may help us improve healthcare and disaster readiness for years to come.</span></p><p><span style="color:inherit;"><span><br></span></span></p><p><span style="font-size:11pt;">The money is coming from public and private sources. For-profit and non-profit institutions. Military and civilian agencies. These funding sources accelerate the development and availability of transformative technologies and approaches to protect Americans from health security threats. Here is a partial list and links to some of the Health and Human Services and Department of Defense&nbsp; related funding agencies: NIH-SBIR (</span><a href="https://www.sbir.gov/"><span style="font-size:11pt;">https://www.sbir.gov/</span></a><span style="font-size:11pt;">) , CDC (https://www.cdc.gov/) , BARDA (</span><a href="https://www.medicalcountermeasures.gov/barda/"><span style="font-size:11pt;">https://www.medicalcountermeasures.gov/barda/</span></a><span style="font-size:11pt;">) , DARPA (</span><a href="https://www.darpa.mil/"><span style="font-size:11pt;">https://www.darpa.mil/</span></a><span style="font-size:11pt;">), MTEC (</span><a href="https://www.mtec-sc.org/"><span style="font-size:11pt;">https://www.mtec-sc.org/</span></a><span style="font-size:11pt;">) , MCDC </span><a href="https://www.medcbrn.org/"><span style="font-size:11pt;">https://www.medcbrn.org/</span></a><span style="font-size:11pt;">).</span></p><p><span style="color:inherit;"><span><br></span></span></p><p><span style="font-size:11pt;">Department of Defence (DoD) Consortiums like MTEC and MCDC, facilitate DoD and industrial relationships and funding agreements . Today they are advancing countermeasures to COVID-19 and other infectious diseases. The mission is to protect the population and improve war fighting capabilities.&nbsp; These agencies also understand that the funding helps small businesses survive in tough times and the military has a clear need to promote resilience of the defense industrial base during the COVID-19 pandemic. Biotechnology solutions, point of care medical devices, and therapeutics have become the armaments of the war on pandemics.</span></p><p><span style="color:inherit;"><span><br></span></span></p><p><span style="font-size:11pt;">Philanthropic organizations such as the Bill and Melinda Gates Foundation and the Chan Zuckerberg Initiative are offering funds to fight COVID-19 and care for the sick. These types of organizations can provide expert advice and support to start-ups to bring their solutions to the COVID-19 induced healthcare crisis.&nbsp;</span></p><p><span style="color:inherit;"><span><br></span></span></p><p><span style="font-size:11pt;">Several start-up Incubators such as SOSventures/IndieBio, QB3, J&amp;J Innovation Centers are offering seed funds ranging from $25,000 to $250,000 in exchange for an equity stake in the venture. The COVID-19 specific offerings have an urgency to them not seen in the past.The announcements are occuring at a fast clip in March and April. Often applicants are given days to weeks to respond with a technical proposal and detailed budget. Often the product or idea must be completed and ready for deployment&nbsp; in 3-12 months. The areas of interest include Point of Care Diagnostics, Prophylactics, Ready-to-Go Therapeutics, Medical Devices, Protective Gear</span></p><p><span style="font-size:11pt;">Computer Modeling, Disease Tracking, and AI for Drug Discovery.</span></p><p><span style="color:inherit;"><span><br></span></span></p><p><span style="font-size:11pt;">BioTether Sciences is proud to be a member of Medical Technology Enterprise Consortium, (MTEC), the NIH-Small Business Innovative Research (SBIR) program, and the State and Federal systems for award management (eProcure, and betaSAM.gov). We are developing technologies for diagnostics, prophylactic and therapeutics to fight COVID-19. Our technologies exploit high affinity interactions between target-receptor, antigen-antibody and other ways macromolecules interact.</span></p><p><span style="color:inherit;"></span></p><div><span style="font-size:11pt;"><br></span></div></div>
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</div></div></div></div></div></div> ]]></content:encoded><pubDate>Fri, 27 Mar 2020 13:24:19 -0700</pubDate></item><item><title><![CDATA[Here is how clinical labs test for COVID-19]]></title><link>https://www.biotether.com/blogs/post/Here-is-how-clinical-labs-test-for-COVID-19</link><description><![CDATA[<img align="left" hspace="5" src="https://www.biotether.com/COVID19 image.png"/>The CDC and others have developed multiple tests for COVID-19.]]></description><content:encoded><![CDATA[<div class="zpcontent-container blogpost-container "><div data-element-id="elm_1zELOQxYScW9y0D4BBHv2g" data-element-type="section" class="zpsection "><style type="text/css"></style><div class="zpcontainer-fluid zpcontainer"><div data-element-id="elm_xH3OXOkUQ5mPhIRIYJqz3Q" data-element-type="row" class="zprow zprow-container zpalign-items- zpjustify-content- " data-equal-column=""><style type="text/css"></style><div data-element-id="elm_rJ1lUF7tQneB8eTbzJneQQ" data-element-type="column" class="zpelem-col zpcol-12 zpcol-md-12 zpcol-sm-12 zpalign-self- "><style type="text/css"></style><div data-element-id="elm_CUPt6l_YQ2u3G1EVt5NnfQ" data-element-type="heading" class="zpelement zpelem-heading "><style> [data-element-id="elm_CUPt6l_YQ2u3G1EVt5NnfQ"].zpelem-heading { border-radius:1px; } </style><h2
 class="zpheading zpheading-align-center " data-editor="true">Lab Tests for COVID-19</h2></div>
<div data-element-id="elm_NpkDPe4OQ4mkj820zAWXHg" data-element-type="text" class="zpelement zpelem-text "><style> [data-element-id="elm_NpkDPe4OQ4mkj820zAWXHg"].zpelem-text { border-radius:1px; } </style><div class="zptext zptext-align-left " data-editor="true"><p><br></p><p><span style="font-size:13pt;">(Created using information from the CDC.gov website)</span></p><p><span style="font-size:13pt;">The CDC works closely with state and local public health departments, travel industry partners, and others to identify and test people who may be infected with COVID-19. There are &nbsp;several different laboratory tests to detect COVID-19 infection. The testing strategy is based on experience from the SARS and MERS outbreaks.</span></p><p><span style="font-size:13pt;">In general, these lab tests fall into two categories:</span></p><ul><li><a href="https://www.cdc.gov/coronavirus/mers/lab/lab-testing.html#molecular"><span style="font-size:13pt;">Molecular tests</span></a><span style="font-size:13pt;">, which look for evidence of active infection; and</span></li><li><a href="https://www.cdc.gov/coronavirus/mers/lab/lab-testing.html#serology"><span style="font-size:13pt;">Serology tests</span></a><span style="font-size:13pt;">, which look for previous infection by detecting antibodies to COVID-19. Serology tests are for surveillance or investigational purposes and not for diagnostic purposes.</span></li></ul><p><span style="font-size:18pt;">Molecular Tests</span></p><p><span style="font-size:13pt;">Molecular tests are used to diagnose&nbsp;<b>active infection</b>&nbsp;(presence of COVID-19) in people who are thought to be infected based on their clinical symptoms and having links to places where COVID-19 has been reported.</span></p><ul><li><span style="font-size:13pt;">Real-time reverse-transcription polymerase chain reaction (rRT-PCR) assays are molecular tests that can be used to detect viral RNA in clinical samples. CDC’s current case definition for laboratory confirmation of COVID-19 infection requires a positive rRT-PCR result for at least two specific genomic targets. Sequencing may also be used as a confirmatory test.</span></li><li><span style="font-size:13pt;">Increasingly laboratories in the United States are approved to test for COVID-19 by using an rRT-PCR assay developed by CDC. This test is done under authority of an&nbsp;</span><a href="https://www.cdc.gov/coronavirus/mers/lab/index.html"><span style="font-size:13pt;">Emergency Use Authorization</span></a><span style="font-size:13pt;">&nbsp;because there are no FDA-cleared/approved tests available for this purpose in the United States.</span></li><li><span style="font-size:13pt;">The success of rRT-PCR testing depends on several factors, including the experience and expertise of laboratory personnel, laboratory environment (e.g., avoidance of contamination), and the type and condition of specimens being tested. For this rRT-PCR assay, CDC recommends collecting multiple specimens, including lower (bronchalveolar lavage, sputum and tracheal aspirates) and upper (e.g., nasopharyngeal and oropharyngeal swabs) respiratory samples, serum, and stool specimens.</span></li><li><span style="font-size:13pt;">CDC considers a person under investigation to be negative for active COVID-19 infection following one negative rRT-PCR test on the recommended specimens. Since a single negative result does not completely rule out infection, in some circumstances additional specimens may be tested.</span></li><li><span style="font-size:13pt;">CDC considers a known the patient to be negative for active COVID-19 infection following two consecutive negative rRT-PCR tests on all specimens.</span></li></ul><p><span style="font-size:18pt;">Serology Tests</span></p><p><span style="font-size:13pt;">Serology testing is used to detect&nbsp;<b>previous infection</b>&nbsp;(antibodies to COVID-19) in people who may have been exposed to the virus. Antibodies are proteins produced by the body’s immune system to attack and kill viruses, bacteria, and other microbes during infection. The presence of antibodies to COVID-19 indicates that a person had been previously infected with the virus and developed an immune response.</span></p><p><span style="color:inherit;"></span></p><ul><li><span style="font-size:13pt;">Evidence to date suggests there may be a broader range of COVID-19 disease than was initially thought. For this reason, public health scientists are working to learn more about how the virus is transmitted. One way to do this is through voluntary testing of blood samples from people who had close contact with people known to have COVID-19.</span></li><li><span style="font-size:13pt;">CDC has a two-phase approach for serology testing, using two screening tests and one confirmatory test to detect antibodies to MERS-CoV.</span></li><ul><li><span style="font-size:13pt;">ELISA, or enzyme-linked immunosorbent assay, is a screening test used to detect the presence and concentration of specific antibodies that bind to a viral protein. </span></li><li><span style="font-size:13pt;">The microneutralization assay is a highly specific confirmatory test used to measure neutralizing antibodies, or antibodies that can neutralize virus. This method is considered a gold standard for detection of specific antibodies in serum samples. However, compared with the ELISA, the microneutralization assay is labor-intensive and time-consuming, requiring at least 5 days before results are available.</span></li><ul><li><span style="font-size:13pt;">If a clinical sample is positive by either ELISA, and positive by microneutralization, the specimen is determined to be confirmed positive.</span></li><li><span style="font-size:13pt;">If a clinical sample is positive by both ELISAs, and negative by microneutralization, the sample is determined to be indeterminate.</span></li><li><span style="font-size:13pt;">If a clinical sample is positive by only one ELISA, and negative by microneutralization, the sample is determined to be negative.</span></li><li><span style="font-size:13pt;">If a clinical sample is negative by both ELISAS, the sample is determined negative.</span></li></ul><li><span style="font-size:13pt;">In the end, a final determination of a confirmed positive serology result requires a positive ELISA test and confirmation by microneutralization assay.</span></li></ul></ul></div>
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</div></div></div></div></div></div> ]]></content:encoded><pubDate>Wed, 04 Mar 2020 11:16:25 -0800</pubDate></item></channel></rss>