This is an antibody test which will only be positive days after the onset of symptoms.
This isn't really what your Twitter link says. That links says: "Both IgM & IgG (those are two different kinds of antibodies, with IgA being a third) were low or undetectable at day 0, but increased by day 5 in nearly all patients (N=16)"
-- Reports strongly indicate there are many infected people who are asymptomatic after five days.
Which is to say, this test could be extremely useful if applied widely and systematically to many people; food service workers, health care workers and so-forth.
Currently the virus test has a week turn around time. So both tests effectively find people with a week's exposure.
I think the acceptable value for N depends on the size of the effect being studied.
For example if it’s a massive effect, maybe 10 people is sufficient, but if it’s tiny enough to get swallowed up in statistical noise until you have 1000, then you need N >= 1000
This isn't really what your Twitter link says. That links says: "Both IgM & IgG (those are two different kinds of antibodies, with IgA being a third) were low or undetectable at day 0, but increased by day 5 in nearly all patients (N=16)"
-- Reports strongly indicate there are many infected people who are asymptomatic after five days.
Which is to say, this test could be extremely useful if applied widely and systematically to many people; food service workers, health care workers and so-forth.
Currently the virus test has a week turn around time. So both tests effectively find people with a week's exposure.