In an article published by the New York Times on July 4, hundreds of scientists from all over the world claim that there is evidence that novel coronavirus in smaller particles in the air can infect people, and they are calling for the World Health Organization to revise recommendations.

The World Health Organization has said that the coronavirus itself is spread primarily from person to person through small droplets from the nose or mouth, which are expelled by infected people in coughs and sneezes.

The NYT said that the researchers will plan to publish their letters in a scientific journal next week. The forthcoming paper will be entitled, “It is Time to Address Airborne Transmission of Covid-19,” wherein 239 signatories attempt to raise awareness about the clear evidence that the virus can spread indoors through aerosols that linger in the air and can be infectious even in smaller quantities than previously thought.

The evidence for the virus spreading by air was unconvincing, according to the NYT.

“Especially in the last couple of months, we have been stating several times that we consider airborne transmission as possible but certainly not supported by solid or even clear evidence,” Dr. Benedetta Allegranzi, the W.H.O.’s technical lead on infection control, was quoted as saying by the NYT. “There is a strong debate on this.”

Whether carried by large droplets that zoom through the air after a sneeze, or by much smaller exhaled droplets that may glide the length of a room, the coronavirus is borne through air and can infect people when inhaled, the scientists said, according to the NYT.

“WHO’s credibility is being undermined through a steady drip-drip of confusing messages, including asymptomatic spread, the use of masks, and now airborne transmission,” said Lawrence Gostin, a professor of global health law at Georgetown University who provides technical assistance to the organization, in an article published by the Washing Post.

The WHO did not immediately respond to a request for comment from Reuters.