A top hospital physician on Tuesday advised people not to step inside tree hollows in their quests to observe lesser false vampire bats due to the risk of exposure to dangerous fungus spores.

Dr Manoon Leechawengwongs, a pulmonologist from Vichaiyut Hospital, issued the warning on his Facebook fan page after seven out of 10 people contracted an infection, called Histoplasmosis, after entering a tree hollow in Nakhon Si Thammarat while looking for the bats.