Immunologist warns that new vaccines won't end threat of spreading coronavirus to the vulnerable, says the vaccinated will still need masks.

While Israel hailed the arrival this week of the first doses of the coronavirus vaccine developed by Pfizer and BioNTech, the vaccine’s ability to return life to normal may be limited, an expert has warned.

Michal Tal, an immunologist at Stanford University, hinted that some of the optimism regarding the impact of the new vaccines developed by Pfizer and Moderna may be overblown, according to a report by The New York Times.

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Tal noted that the high efficacy rates reported by Pfizer and Moderna for their vaccines – both rated at over 90% effectiveness – relate only to the ability of the vaccine to prevent vaccinated individuals from developing symptomatic cases of the virus.

Vaccinated, asymptomatic people may still be able to spread the virus to others, Tal warned, including to people in high-risk groups.

Tal cautioned that until the effect of the vaccines is better understood, even those immunized with the vaccines must continue to wear masks in public.

“A lot of people are thinking that once they get vaccinated, they’re not going to have to wear masks anymore. It’s really going to be critical for them to know if they have to keep wearing masks, because they could still be contagious.”

While the vaccines are injected into arm muscles, prompting the body to produce antibodies, the coronavirus spreads primarily via mucous from the nose, where the virus tends to build up the most. Read more at Arutz-7