The Vaccination against Covid-19 Prevents the Transmission of the Virus
A growing body of evidence suggests that the Covid-19 vaccine can slow the spread of the coronavirus, Dr. Anthony Fauci said Wednesday. Whether vaccination can prevent transmission of the virus is “the looming question,” Fauci, director of the National Institute of Allergy and Infectious Diseases, said during a White House coronavirus response team briefing.
“If a person gets infected despite being vaccinated — we refer to that as a ‘breakthrough’ infection — does that person have the capability of transmitting to another person?” “There have been some studies that are pointing in a very favorable direction,” he said, adding that these studies will have to be corroborated by additional research.
Fauci highlighted two recent studies that looked at a person’s viral load — that is, how much virus he or she has in the body — and transmissibility. One study from Spain, published Feb. 2 in The Lancet, found a direct correlation between viral load and transmissibility. The higher the viral load, the greater the transmissibility of the virus.
That’s in line with what years of research on HIV have shown: there’s a direct link between the viral load in someone’s blood and the likelihood that individual will transmit HIV to a sexual partner, Fauci said.
For SARS-CoV-2, the virus that causes Covid-19, researchers are focused on how much virus is found the nasopharynx, the upper part of the throat behind the nose that’s reached with a long, skinny swab.