Long Covid

Comment on a report in New Scientist, October 31-November 6, 2020, pp. 10-13.

The latest data show that symptoms of covid-19 persist for up to four months in some people. Probably longer, as the study stopped at that point. The symptoms range from fatigue through “brain-fog” and memory loss through problems breathing. Blood clots threaten to provoke strokes. Headaches are common. Damage to heart, lungs, and other organs has been observed. Hospitalised people appear most likely to suffer these symptoms. The data are incomplete, but it’s likely that around 5% of people who recover from covid-19 will experience more or less serious symptoms two months or more after the onset of the infection.

I think that somewhere between one and five percent will suffer from “long covid”, defined as debilitating symptoms for two months or longer. That’s a serious consequence, since these people will need some continuing care, and/or accommodation at work. The more severe cases will be unable to work at all. The economic losses will be high, combining lost productivity and cost of care. Or, to put it another way: a significant proportion of human and other resources will be diverted from the usual economic activities.

Unanswered questions: Who is most likely to be affected, and why? What kinds of treatment will mitigate long covid? How long will it actually last?