Abstract: The newest public health problem in Iran is biting and stinging of newly reported fire ant Pachycondyla sennaarensis (Hymenoptera: Formicidae) in south and southeast of the country. They annoy the residents by invasion into home and human premises. This study was conducted to determine the incidences of their biting and their effects on routine life of people in Iranshahr and Sarbaz counties. The questionnaire, prepared for this reason, was completed in random cluster manner. Effects of biting was surveyed and also photographed in a healthy volunteer. The results revealed that biting of the ant is mild and none of bitten individuals had systematic reactions. At least 92.5% of questioned individuals had bitten at least one time with this ant. Incidence of biting had no differ between men and women (50.9 and 49.1%) (p>0.05). The majority of people (69.2%) were bitten on limbs (hands and legs) (p<0.01). The sore of biting was tolerable for majority of individuals (89.2%) while 38% of them was suffered pain for a few hours (p<0.01). Its ecological requirements such as temperature range and humidity of soil can be found in other parts of Iran therefore it is the subject of spreading to other parts of the country.