12/n If you run an antibody test on a large group of people, it's called a serosurvey (because antibody tests are also known as serology in sciency terms)
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23/n THIS DOESN'T MEAN THAT CONVENIENCE SAMPLES ARE USELESS I use them in my research. They are brilliant for quick, cheap tracking of rates of infection IN SELECT GROUPS They also provide a brilliant window into change OVER TIME
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24/n For example, if you sample blood donors every week for a year, you've got an amazing insight into the changing nature of the pandemic THIS IS MASSIVELY IMPORTANT AND VERY CHEAP
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25/n You just can't use those results to tell how many people in the rest of society have gotten COVID-19 But that doesn't mean the results aren't helpful at all
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