Pandemic controller David Manning said that the flight was to have brought in Chinese nationals working for the Ramu nickel mine in Madang Province, who were believed to have been part of a Covid-19 vaccination trial, NBC News reported.
"In light of the lack of information on what these trials are and what possible risks or threats they may cause our people if they were to come into the country, I cancelled that flight.
"Until the Chinese government through the Chinese Embassy in Port Moresby provide that information I will be best guided by our health and medical experts here as to what would be the appropriate steps to take when considering looking at applications of Chinese nationals that have been subjected to these vaccination trial entering the country," Manning said.
Manning said he had written to the Chinese ambassador and Ramu nickel to provide information on the vaccination trial, NBC News reported.
Ramu nickel had apparently issued an official statement to the National Department of Health informing them that 48 of its staff had been vaccinated with SARS-Cov-2 vaccine on August 10 this year.