Prognosis
Why Don't Covid Tests Seem to Work as Well as They Used To?
- Don’t let symptoms dictate when to test, immunologist says
- Testing time should reflect body’s changing response to Covid
The faster immune system response led some scientists to believe that the coronavirus’s incubation period has shortened over time.
Photographer: David Paul Morris/BloombergThis article is for subscribers only.
With Covid outbreaks being whipped up for a fifth year, testing has emerged as a source of frustration once again.
Whereas obtaining a test was often difficult in early 2020, now the abundance of cheaper rapid kits in grocery stores and home medicine cabinets has led to a new concern — they don’t seem to work.