The concept of contact tracing isn't new with COVID-19. It's been used successfully for sexually transmitted diseases, tuberculosis, and smallpox, among other conditions.
from WebMD Healthhttps://img.webmd.com/dtmcms/live/webmd/consumer_assets/site_images/article_thumbnails/news/2020/04_2020/serology_lab_covid_antibodies/1800x1200_serology_lab_covid_antibodies.jpg https://ift.tt/3jby4WO
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