William A. Haseltine, Contributor

Earlier this month, I detailed one of such variants beginning to circulate in Southern California (B.1.427/429). In the weeks since, the virus has predictably grown in prevalence.

After months of battling SARS-CoV-2, the government is asking students to test themselves twice a week before they can attend class.

Should patients hospitalized for Covid-19 be treated with anticoagulants as early as possible, or should treatment be delayed until clinical signs indicate that hyper-coagulation is likely?

After a period of decline, we are now seeing a rise in Covid-19 cases globally and in the U.S. A disturbing trend likely due to the spread of new variants that should caution us against the complacency that some governors are showing by rolling back st…

Variants confer new and dangerous properties including increased transmission, the ability to evade the immune response elicited from previous infection or vaccination, and increased virulence and infection, especially in children. It is in this contex…

According to a recent preprint study, the one-two punch of prior infection and at least one dose of a Moderna or Pfizer-BioNTech vaccine can generate a powerful immune response that neutralizes both the original Wuhan strain and the B.1.351 variant.

How serious the problem will be will depend on how many different variants there are, how they differ from one another, how capable they are of reinfecting people, and of resisting current and future vaccines. In this context, here we describe the newf…

Protective antibodies also decline over time and memory B cells persist, according to a recent study published in Nature that tests the strength of vaccinee and convalescent sera against new Covid-19 variants.

Two recent studies indicated that the infection incubation period for the variants is longer than the SARS-CoV-2 strain, therefore we need to adjust the quarantine period to three weeks as China has done.