The negative test result: https://pcr.euprava.gov.rs/validate.php?cqcode=1640187792DOH... The positive test result: https://pcr.euprava.gov.rs/validate.php?cqcode=1640524880jk8...
'Цовид-19' has to be one of the laziest transliterations I've ever seen. Coronavirus is spelled with an initial К in every Cyrillic-using language I'm aware of, not a Ц (ts) sound in English. It's basically a keyboard IME transliteration, since in Serbian, "c" would be the Roman equivalent of "ц".
Croatia, for example has its official coronavirus webpage as https://koronavirus.hr