Health
Pasteurization of human milk inactivates the Covid-19 virus: a study
“There is no evidence that the virus can be transmitted through breast milk, but there is always a theoretical risk,” said Greg Walker, principal author of the University of New South Wales, Australia.
There are five breastfeeding banks in Australia, according to a study published in the Pediatrics and Children’s Health Journal. As the Covid-19 pandemic evolves, these milk banks will continue to provide donated breast milk to preterm infants who do not have access to their mother’s breast milk.
Donors are screened for disease, milk is tested and pasteurized to ensure that it is medically safe for fragile babies.
“We wanted to show that PDHM is safe because we’ve seen that past pandemics can interrupt the supply of pasteurized donor breast milk (PDHM) for safety reasons.” Said Walker.
In this study, the team worked at the Kirby Institute’s PC-3 lab to ly infect a small amount of frozen and freshly expressed milk from a healthy Lifeblood Milk donor. The milk sample was then heated and now infected with SARS-CoV-2 and heated at 63 degrees Celsius for 30 minutes to simulate the pasteurization process performed in a milk bank. Studies show that after this process, infectious live virus is not included.
“Our findings show that SARS-CoV-2 virus can be effectively inactivated by pasteurization.”
The researchers say their experiment simulated the worst theoretical scenario.
“The amount of virus we use in the lab is much higher than that found in breast milk in women with Covid-19, so we can really be confident in these discoveries,” Walker said. ..
Researchers also tested whether storing SARS-CoV-2 in breast milk at 4°C or 30°C inactivates the virus-for the first time in an experiment the stability of an ly infected virus was evaluated. Was Coronavirus In breast milk under common storage conditions.
“We found that refrigeration did not significantly affect infectious viral load over 48 hours,” the study authors wrote.
“Freezing milk reduced the virus that was present slightly, but recovered the virus that could survive after 48 hours of storage,” they said.
In early July, a Canadian study published in the journal CMAJ found that pasteurizing breast milk using common techniques inactivates the Covid-19 virus.
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