I would ask about testing: if there were any tests, when were the samples gathered, what were the results, what kind of test was used (RNA/antibodies), which country/institution performed the test (that last one might help infer what kind of test was used)
I would ask about testing: if there were any tests, when were the samples gathered, what were the results, what kind of test was used (RNA/antibodies), which country/institution performed the test (that last one might help infer what kind of test was used)