According to the attached official letter, effective from 12JUN2022, 04:01 (UTC) on Sunday, the implementation of submitting negative PCR & rapid antigen test results/recovery letter from doctor has been cancelled.
Also, with this order, attestation form requirement is no more required.
Meanwhile, vaccination requirement still continue, US citizens and green card holders are exempted. Nonimmigrant visa holder passengers are required to submit vaccination card/certificate. For example, tourist visa holder passenger must be vaccinated in order to be able travel to USA.
Passengers under 18 years old are exempted to be vaccinated. You can refer to details in the attachment and in the below e-mail, please refer to link for details of exempted passengers and accepted vaccines.