HTTP API for Latest Covid-19 Data.
Coronavirus API is a free Health API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
Details from pipedream.com.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Maps, datasets, applications and more in the context of COVID-19
The Coronavirus API is provided by Pipedream (pipedream.com).
Yes. The Coronavirus API is listed in the Health category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The Coronavirus API requires no authentication, so you can start making requests without signing up.
CORS support for the Coronavirus API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Coronavirus API is served over HTTPS, so it's safe to use in production.