Mark Jit

Mark Jit is professor of vaccine epidemiology at the London School of Hygiene & Tropical Medicine.

SPI-M modellers: a response to our critics

In late November, scientists in South Africa and Botswana identified a new variant of the virus that causes Covid. This variant — later named Omicron — was spreading rapidly throughout South Africa, particularly in Gauteng, its most populous province. As well as reporting these concerning epidemiological facts, South African scientists worked quickly to identify Omicron’s