explainers

What Is Contact Tracing?

What Is Contact Tracing?

Contact tracing is a critical tool for containing a disease outbreak. For COVID-19, it’s also a key part of plans like the World Health Organisation’s guidelines for easing distancing restrictions. So what is contact tracing and how does it work?

What Is The Coronavirus’s R0 And Why Does It Matter?

What Is The Coronavirus’s R0 And Why Does It Matter?

If you want to describe how an infectious disease spreads, one handy number is what epidemiologists call R0 (“R naught”), the disease’s basic reproductive number. Right now, scientists are trying to figure out the R0 for the new coronavirus from Wuhan, China. So far, it seems to be a little…

Why An Ectopic Pregnancy Can’t Be ‘Reimplanted’

Why An Ectopic Pregnancy Can’t Be ‘Reimplanted’

Over the past few years, U.S. states have been considering or even passing bills designed to outlaw abortion. A recent one, in Ohio, includes a provision that seems to require doctors to “reimplant” an ectopic pregnancy, a procedure that does not exist in medicine. So what is an ectopic pregnancy…