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Infection and Spread

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What is the chance of a “breakthrough” infection after vaccination?

Infection and Spread Vaccines

A: Quite low, but not zero. The U.S. Centers for Disease Control and Prevention (CDC) recently released data on reported breakthrough cases—meaning a positive SARS-CoV-2 test more than 2 weeks after FULL vaccination. TL;DR: ➡️ 5,814 cases were reported out of over 75 MILLION people who were fully vaccinated by this time. ➡️ 396 people Read more…

Dear Pandemic COVID Q&A

Clinical Symptoms Infection and Spread Vaccines Videos

In this live Q&A, we’ll be talking with the operators of two other #SciComm pages, Unambiguous Science and ScienceWhizLiz. We’ll talk about the J&J vaccine pause, fleas, Canadian geese, kids and COVID, long COVID, and creative vaccine strategies. ➡️ Welcome, Intros, and Chit Chat (0:00-3:40) ➡️ Can flea bites transmit COVID-19? (3:40-5:26) ➡️ Blood clotting Read more…

I thought that Peru was one of the first countries to go into lockdown. What is the situation there now?

Data and Metrics Infection and Spread

A: Peru has one of the highest excess death rates in the world and more than 47,000 people in Peru have died from COVID-19 as of March 2021 with excess deaths at nearly 2,600 per million (from a population of 32 million). How did this happen? TL; DR: Controlling COVID-19 requires many public health measures Read more…

If we have never achieved herd immunity with the flu, the common cold and many other diseases, what makes it possible to reach herd immunity with COVID-19?

Infection and Spread Vaccines

A: Some diseases are more elusive than others when it comes to herd immunity, and your two examples are among the elusive ones. In order to be a candidate for herd immunity, we need a disease caused by one specific virus. The virus has to be easily recognized by the immune system; it can’t mutate Read more…

Dear Pandemic COVID Q&A

Infection and Spread School Staying Safe Testing and Contact Tracing Vaccines Videos

In this live Q&A, we’re teaming up with our science gal-pals at the Unbiased Science Podcast, Drs. Andrea Love and Jessica Steier! We’ll be answering reader questions about antibody testing after vaccination, viral variants & kids, #thrifting, and whether your COVID-19 vaccine can make you test positive for COVID.  https://www.facebook.com/unbiasedscipod/ ➡️ Welcome, Intros, and Comments Read more…

What are the rules for family get-togethers with vaccinated adults and unvaccinated kids?

Families/Kids Infection and Spread

A: We offer a few guiding principles. Severe complications of COVID-19 infection are significantly decreased among the vaccinated but infection risk is not zero. Unvaccinated people remain at risk of infection +/- complications. Determine what is important. Maintain as many risk mitigation strategies as realistic. This is not over yet. ☠️ Vaccination greatly decreases the Read more…

What accounts for the recent drop in COVID-19 cases in the US?

Data and Metrics Infection and Spread

Q: It looks like Covid-19 infection rates have dropped significantly in the US since the vaccine became available. Is the vaccine already having an impact? What else would account for the drop?” A: Of all the possible explanations — vaccination, immunity from prior infection, behavior change, seasonality, and less testing — the best answer seems to Read more…