Of course there is...they're not testing every person because it isn't necessary.
Early in the pandemic India had a fairly low infection rate despite not having a vaccine and people attributed that to the widespread use of HCQ for malaria. The virus eventually adapted itself to overcome the protection HCQ provided and the Delta variant emerged.
omg The vaccine trials were conducted in India, duh. The Delta variant emerged there in response to these clot shots in April 2021. Now it’s the Delta variant ravaging Israel where 85% of adults received 2 doses of Pfizer. It is the vaccine that is worse than worthless.
Do you have a linked about the testing for the Delta variant?