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The four staff members were training the players at their camp in Nakhon Pathom before they tested positive, TVA said.
After testing the players, coaches and other members of staff, 22 players were found to be infected, the association added.
However, TVA said the Fédération Internationale de Volleyball (FIVB) has not barred the team from participating in the Nations League to be held in Rimini, Italy from May 25 to June 25.