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Strange terms and epidemiology

How is antigen testing different from antibody testing?

What does asymptomatic mean?

What does Crush the curve mean?

What does exponential growth mean?

What does R0 mean?

What is a casual contact?

What is a close contact?

What is a mass gathering?

What is a 'second wave' of an illness?

What is an antigen?

What is COVID-19 herd immunity?

What is hydroxychloroquine?

What is serology or a serology test?

What is the differences between an outbreak, epidemic, and pandemic?