A recent study in the U.K., published in Nature, found that a single shot of the Pfizer vaccine reduced illness from the Delta variant by 33 percent. Q: If you've already had COVID-19 and are getting the vaccine, do you need to get both shots? For instance, a study in China, recently published in The Lancet, showed that only 40 percent of people who had gotten COVID-19 carried antibodies to the coronavirus months later. Some studies also suggest that vaccines provide better protection for longer than natural infection. One big benefit of vaccination is that it reduces the overall level of virus in a population, which makes everyone safer. Q: If you've already had COVID-19 with mild symptoms, what are the benefits of getting the vaccine? Here, an Ironman competition in Hermosa Beach, California on July 4th. Because the Delta variant is so highly transmissible, the CDC now recommends mask wearing for everyone in indoor settings in regions where virus levels are high.ĭelta is prompting many people to rethink plans to resume activities that involve large crowds of unmasked people-but not everyone. Vaccinated people who are immunocompromised or are caring for someone who is vulnerable at home may want to keep their potential exposure to the virus as low as possible-which means avoiding crowded, poorly ventilated rooms and wearing masks when indoors with others who may not be vaccinated. The risk for an unvaccinated person is always higher than for a vaccinated person. In an office where many people are unvaccinated and virus levels are high, the risk can be many times higher. In an office where everybody is vaccinated and virus levels in the community are low, the risk is small. It depends on an individual's health, circumstances and tolerance for risk. Q: Is it safe to go back into an office to work? Florida Tops Previous COVID Hospitalization Record by Over 1,100.Lambda COVID Variant, Behind 1,000 Cases in U.S., Shows Vaccine Resistance.These States Are Seeing the Lowest Numbers of New COVID Cases.A study in the journal Nature suggested that the mRNA vaccines have potentially long-lasting immunity. Pfizer recently said that the effectiveness of its mRNA vaccine declines to 84 percent about four to six months after the second shot, based on an internal study that has not yet been peer reviewed. Q: When does the immunity from the vaccine start to wane? Is it the same for mRNA vaccines and others? Recently, reports of loss of smell and taste have become less common, according to the Zoe Covid Symptom study. However, Delta can also manifest more like a bad cold, with a runny nose, sore throat and headache. Symptoms from many variants are similar to those of the original virus-fever, dry cough, shortness of breath. Q: Are the symptoms different between the variants? To find out how prevalent a variant is, the CDC takes samples, identifies them by sequencing their genetic material and then estimates what proportion of infections a given variant accounts for. Q: How do doctors determine which variant you have?ĬOVID-19 tests don't identify variants. ![]() ![]() Read more A 'Universal Vaccine' May Soon Protect Against All Coronaviruses The study found that the Astra-Zeneca vaccine was 67 percent effective against Delta, as opposed to 74.5 for Alpha. The Moderna mRNA shot is thought to offer similar protection. A study published in the New England Journal of Medicine in July showed that the two-shot Pfizer mRNA vaccine was 88 percent effective in preventing illness due to the Delta variant, down from 93.7 percent for the Alpha variant. Q: How great is the risk of getting sick if you've gotten the vaccine? Here are answers to some other common questions: For instance, people with weakened immune systems should be more cautious than those with robust immune systems. Figuring out when to take risks and when not to is largely a matter of individual circumstance and preference. That's one reason why the Centers for Disease Control and Prevention ( CDC) recently changed its masking recommendations-it now advises vaccinated people in areas with high levels of virus to wear a mask indoors. The rise of Delta, which is far more easily transmitted from person to person than previous strains of the virus, has made going out in public riskier.
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