1. No vaccine is 100% effective.
Large clinical trials found that two doses of the Moderna and Pfizer-BioNTech vaccines prevented 95% of illnesses caused by the coronavirus. While those results are impressive, 1 in 20 people are left unprotected, said Dr. Tom Frieden, a former director of the Centers for Disease Control and Prevention.
2. Vaccines don’t provide immediate protection.
No vaccine is effective right away, Malani said. It takes about two weeks for the immune system to make the antibodies that block viral infections.
Covid vaccines will take a little longer than other inoculations, such as the flu shot, because both the Moderna and Pfizer products require two doses. The Pfizer shots are given three weeks apart; the Moderna shots, four weeks apart.
3. COVID vaccines may not prevent you from spreading the virus.
Vaccines can provide two levels of protection. The measles vaccine prevents viruses from causing infection, so vaccinated people don’t spread the infection or develop symptoms.
Most other vaccines — including flu shots — prevent people from becoming sick but not from becoming infected or passing the virus to others, said Dr. Paul Offit, who advises the National Institutes of Health and Food and Drug Administration on covid vaccines.
4. Masks protect people with compromised immune systems.
People with cancer are at particular risk from covid. Studies show they’re more likely than others to become infected and die from the virus, but may not be protected by vaccines, said Dr. Gary Lyman, a professor at Fred Hutchinson Cancer Research Center.
Cancer patients are vulnerable in multiple ways. People with lung cancer are less able to fight off pneumonia, while those undergoing chemotherapy or radiation treatment have weakened immune systems. Leukemia and lymphoma attack immune cells directly, which makes it harder for patients to fight off the virus.
5. Masks protect against any strain of the coronavirus, in spite of genetic mutations.
So far, studies suggest vaccines will still work against these new strains.
One thing is clear: Public health measures — such as avoiding crowds, physical distancing and masks — reduce the risk of contracting all strains of the coronavirus, as well as other respiratory diseases, Frieden said. For example, the number of flu cases worldwide has been dramatically lower since countries began asking citizens to stay home and wear masks.
“Masks will remain effective,” Malani said. “But careful and consistent use will be essential.”
The best hope for ending the pandemic isn’t to choose between masks, physical distancing and vaccines, Offit said, but to combine them. “The three approaches work best as a team,” he said.
The full article can be read here – 5 Reasons to Wear a Mask Even After You’re Vaccinated (medscape.com)