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Virus World provides a daily blog of the latest news in the Virology field and the COVID-19 pandemic. News on new antiviral drugs, vaccines, diagnostic tests, viral outbreaks, novel viruses and milestone discoveries are curated by expert virologists. Highlighted news include trending and most cited scientific articles in these fields with links to the original publications. Stay up-to-date with the most exciting discoveries in the virus world and the last therapies for COVID-19 without spending hours browsing news and scientific publications. Additional comments by experts on the topics are available in Linkedin (https://www.linkedin.com/in/juanlama/detail/recent-activity/)
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Single Dose of Antibodies Can Knock Out HIV in Newborns

Single Dose of Antibodies Can Knock Out HIV in Newborns | Virus World | Scoop.it

A single dose of an antibody-based treatment can prevent HIV transmission from mother to baby, new nonhuman primate research suggests for the first time. When that single dose is given is key, however. The study found rhesus macaque newborns did not develop the monkey form of HIV, called SHIV, when they received a combination of two antibodies 30 hours after being exposed to the virus.

 

Delaying treatment until 48 hours, on the other hand, resulted in half of the baby macaques developing SHIV when they were given four smaller doses of the same antibody cocktail. In comparison, the study found macaques that received the current standard HIV treatment – antiretroviral drugs – remained SHIV-free when they started a three-week regimen of that therapy 48 hours after exposure. “These promising findings could mean babies born to HIV-positive mothers can still beat HIV with less treatment,” said the study’s corresponding’s author, Nancy Haigwood, Ph.D., a professor of pathobiology and immunology in the Oregon Health & Science University School of Medicine, as well as the director at the Oregon National Primate Research Center at OHSU.

 

This is the first time a single dose of broadly neutralizing antibodies given after viral exposure has been found to prevent SHIV infection in nonhuman primate newborns. Previous research by Haigwood, Ann Hessell, Ph.D., and others showed four doses of antibodies started 24 hours after exposure prevented SHIV infection, with all 10 of the baby primates in that study not having any SHIV virus for six months. Both studies used a combination of two antibodies called PGT121 and VRC07-523. The new study also suggests a much shorter course of antiretroviral therapy given after virus exposure could prevent HIV transmission to newborns. Human babies born from HIV-positive mothers typically take the drug cocktail – a personalized regimen of multiple drugs taken daily – for about six weeks before being re-tested. If the tests are then positive, they likely need to take HIV drugs for the rest of their lives. But this study showed nonhuman primate newborns didn’t have SHIV after undergoing antiretroviral therapy for just three weeks starting 48 hours after exposure.

 

Published in Nature Communications (07 January 2020):

https://doi.org/10.1038/s41467-019-13972-y

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Link Between Prenatal HIV Exposure and Decreased Infant Immunity in HIV-negative Babies

Link Between Prenatal HIV Exposure and Decreased Infant Immunity in HIV-negative Babies | Virus World | Scoop.it

In the August 16 edition of Nature Scientific Reports, Scientists at the University of Rhode Island provide concrete evidence linking the specific immune responses in HIV-negative babies to the HIV-positive status of their mothers. The work was carried out in the laboratory of Barbara Lohman-Payne, associate research professor with URI's Institute for Immunology and Informatics within its Department of Cell and Molecular Biology, in collaboration with colleagues at the University of Nairobi, the University of Washington and the Karolinska Institute in Sweden.

 

To arrive at their conclusions, researchers compared the T-cell receptor beta-chain repertoire of cord blood samples from HIV-exposed uninfected infants to samples collected from mother-child pairs unaffected by HIV, but who were living in the same communities. Despite the success of antiretroviral therapies in helping to suppress the risk of HIV being passed from mother to child, globally, HIV-exposed uninfected infants are a vulnerable population characterized by increased morbidity and mortality, higher rates of hospitalizations and childhood infections with more severe outcomes.

 

According to Lohman-Payne, "The reasons for these epidemiological findings are poorly understood, largely because it has been difficult to obtain suitably controlled participant samples and health data to allow for careful analysis." Fortunately, Lohman-Payne and her team were able to work with researchers at the University of Nairobi and University of Washington that had established cohorts as part of their work in the 1990s and 2000s, prior to the wide introduction of antiretroviral therapy in Kenya, in order to obtain samples for analysis. The analysis revealed two clusters of HIV-exposed but uninfected babies: one cluster born similar to healthy infants without HIV exposure while the other cluster born with a significantly reduced immune repertoire.  The reduced immune repertoire in HIV-exposed but uninfected infants found in the study may help explain the increased risk of morbidity in this population and emphasizes the need for special care and attention to this group.

 

"For this study to succeed required a multi-year, multi-continent collaboration that provided generous access to the samples we needed," said Lohman-Payne. "Thanks to that collaboration, importantly, we now have a fuller picture of the potential impact of HIV-exposure on infants regardless of their HIV-status."

 

Published on August 16, 2019 in Scientific Reports (Open Access):

https://doi.org/10.1038/s41598-019-48434-4

 

greco's curator insight, December 29, 2022 3:51 PM
une etude qui s'intéresse aux conséquences d'une exposition au VIH avant la naissance sur le bébé né négatif. au dela du simple fait d'être positif ou négatif, avec par exemple une réduction du répertoire immunologique ce qui les rends plus vulnérables malgré l'absence de contamination maternelle.