China's government has said it welcomes Taiwanese to come and get vaccinated against Covid-19 and calls on Taiwan to remove obstacles and allow its people to receive the "highly effective" Chinese shots.

China claims democratically ruled Taiwan as its own territory and has repeatedly offered to send vaccines to the island, which is battling a spike in domestic infections but has expressed concern about the safety of Chinese shots and has not cleared them for use.

China's Taiwan Affairs Office has said in a statement two Chinese-made vaccines have been granted emergency use authorisation by the World Health Organisation and its shots are in use or approved by more than 90 countries, showing their safety and efficacy.

China's offer is not likely to be attractive to many Taiwanese. A Taiwan security official looking into Chinese activities told Reuters the offer was another example of a Beijing influence campaign to sway public opinion on the island.