Antibiotics - these remarkable drugs are capable of killing off biological organisms in our body without harming us. However, two out of three healthy persons in India have antibiotic-resistant organisms in their digestive tracts, according to a study published by the Indian Council of Medical Research (ICMR). The study was based on analysis of stool samples of 207 individuals who had not taken any antibiotics for at least a month and did not suffer from any chronic illness.