🧵1/N New study published in @JAMA_current on re-emergence of vaccine-eliminated infectious diseases under declining vaccination in the US. We model long-term risk and conditions for return to endemicity for measles, rubella, polio, & diphtheria. jamanetwork.com/journals/jama/… 2/N The US eliminated many infectious diseases through widespread childhood vaccines–including measles, rubella, polio, diphtheria, etc. But routine childhood vaccination is declining, and policy efforts could further worsen this. So what will happen if this trend continues?

🧵 1/N How often should I get a #COVID19 booster vaccine? Our new article published in @NatureComms estimates benefit of different frequencies of COVID vaccines against severe disease by risk group (age, immunocompromised status). Check it out here! nature.com/articles/s4146…
2/N Our main analysis uses a microsimulation model to compare one-time, annual, and semiannual (every 6 month) booster vaccines by age group and immunocompromised status, calibrated to epidemiologic data from approximately September 2022.

🧵1/N How do vaccines and/or natural infection change infectiousness of #COVID19 during #Omicron? Our new article published in @NatureMedicine measures #COVID19 infectiousness, and finds reductions from both vaccine and natural infection. nature.com/articles/s4159… 2/N We use detailed epidemiologic data from SARS-CoV-2 surveillance within the California prison system to study #COVID19 transmission. Our goal was to translate these findings into policy to improve health for this vulnerable incarcerated population that remains at high risk.

1/N Our new study published in @TheLancetInfDis on #COVID19 testing strategies for safer airline travel. Getting tested before and after air travel can prevent the spread of #COVID19 and make flying safer. Collab led by the singular Dr. @mathewkiang. thelancet.com/journals/lanin… 2/N What is the best #COVID19 testing strategy when traveling? We find pre-travel testing (PCR 3 days before travel or rapid antigen test on travel day) reduces risk of being infectious on airplane by ~88%, but post-travel quarantine/testing needed to reduce risk of importation.

1/N *Our new pre-print study now posted* What is the best #COVID19 testing strategy when traveling? We find pre-travel testing reduces risk of being infectious on airplane by ~87%, but post-travel quarantine/testing needed to reduce risk of importation. medrxiv.org/content/10.110… 2/N With the holidays, travel is likely to skyrocket. Our analysis finds that no testing strategy can eliminate risk of infection during travel or risk of bringing infection to a new place. Therefore, traveling should only be done when essential, esp given number of #COVID cases!