A model developed by CDC researchers estimates that 59% of coronavirus cases in the United States are spread by asymptomatic carriers. Transmissions from individuals who have not yet begun to exhibit signs of infection account for 35% of that total, while transmissions from people who never develop symptoms make up the other 24%.

In order to deliver COVID-19 vaccine to more people more quickly, the Trump administration intends to expedite rollout of its immunization partnership with pharmacies. The logic behind the concept is that getting vaccinated at a local pharmacy will be more accessible and efficient for many Americans than going to a hospital.

With the COVID-19 immunization campaign moving much more slowly than anticipated, vaccine makers and federal officials are under pressure to do more with the supply on hand. Potential solutions include potentially cutting doses of the Moderna vaccine in half and using more efficient syringes to squeeze more doses from vials of the Pfizer vaccine.

Haven Health—a health care collaboration launched by Amazon, Berkshire Hathaway, and JPMorgan Chase in 2018—will be dismantled next month. The partners had hoped to revolutionize the U.S. health care system, achieving significantly lower costs for their employees in the process.

CDC announced new guidance on January 2 for individuals with underlying health conditions who will be receiving a COVID-19 vaccine.