The World Health Organization (WHO) Director-General Tedros Adhanom Ghebreyesus decided to isolate himself after he came in contact with someone who tested positive for the CCP Virus (Covid-19).

Ghebreyesus announced his self-quarantine in a tweet on Sunday, Nov. 1, adding that he has no symptoms and will work from home as a precaution.

“I have been identified as a contact of someone who has tested positive for #COVID19. I am well and without symptoms but will self-quarantine over the coming days, in line with @WHO protocols, and work from home,” he wrote.

“It is critically important that we all comply with health guidance. This is how we will break chains of #COVID19 transmission, suppress the virus, and protect health systems,” he tweeted.

“My @WHO colleagues and I will continue to engage with partners in solidarity to save lives and protect the vulnerable. Together!” he added.

Though Ghebreyesus is calling for unity, he has not mentioned the identity of the infected contact as a precaution measure for others.

The WHO’s response to the virus pandemic, under Ghebreyesus has been criticized by the United States, which accused the U.N. agency of mismanaging and covering up the spread of the CCP Virus after it first emerged in China—the country which also failed to inform the world about the virus in early days.

President Donald Trump once said he would halt U.S. funding to the WHO because it has “failed in its basic duty” in its late response to the pandemic.

U.S. Secretary of Health and Human Services Alex Azar has also chastised the U.N. health agency of its handling of the outbreak, “That failure cost many lives.”

According to a count of confirmed cases by Johns Hopkins University, the CCP Virus has infected more than 46.5 million people in the world and led to more than 1.2 million deaths globally as of early Monday, Nov. 2.