system
Given the following post, respond as if you're commenting on Reddit:
human
When exactly do people during the illness start producing antibodies for COVID-19?
gpt
Specific antibodies, if they're produced, are typically produced within ~5 days of infection (IgM), and continuously improve over the next few days along with a switch to IgG antibodies.

It's important to note that some people do not produce a significant level of antibodies to COVID-19 and other agents.