BRUSSEL, Aug 27 (Reuters) - The World Health Organization's pandemic programme plans to ship 100 million doses of the Sinovac and Sinopharm COVID-19 shots by the end of next month, mostly to Africa and Asia, in its first delivery of Chinese vaccines, a WHO document shows.

The Chinese shipments will help the sputtering global COVAX vaccine sharing programme which is far behind its pledge to deliver 2 billion doses this year following supply problems and export curbs imposed by major producer India.

It could also boost Beijing's vaccine diplomacy efforts despite concerns over the efficacy of the Chinese shots, which have been turned down or paired with boosters from Western manufacturers by some of the recipient countries.

Of the 100 million Chinese vaccines, half will be provided by Sinopharm and half by Sinovac, with deliveries planned for "July to September 2021", a WHO document dated July 29 says.

About 10 million Sinopharm shots had been shipped by mid-August, a spokesperson for the Global Alliance for Vaccines and Immunization (GAVI), which co-leads COVAX along with the WHO, told Reuters.

Sinopharm, Sinovac and China's trade ministry did not respond to requests for comment about when the Chinese vaccines would be delivered.

The Chinese vaccines have been allocated to 60 countries, mostly in Africa, which is expected to receive a third of the 100 million doses.