Quarantine and testing is at cost of passengers arriving and leaving. The fees for the PCR test is 50.000 XAF for EG nationals and 110.000 XAF for all other nationals.
Travelers arriving without a valid and negative PCR test, will be sent to mandatory government quarantine and undergo COVID-19 testing at their own cost. If they are sent to a mandatory quarantine hotel, as soon as they are able to, they should email firstname.lastname@example.org with their contact details, name, and date of birth.
Children under the age of 2 are exempt from presenting a COVID-19 test.
Travelers with proof of recovery from the virus within the last 90 days prior to boarding. Proof of a recent positive viral test and a letter from your healthcare provider or a public health official stating that you were cleared to travel.
More info at the CDC site
Travelers who did not get tested, are advised to stay home and self-quarantine for 10 days after travel.