Cockroaches act as mechanical vector in transmitting Salmonella,Shigella, and Cryptosporidium parvum bacteria that cause diarrheal diseases. Antibiotic resistant strain of Klebsiella pneumoniae bacteria that cause pneumonia has been found in patients and cockroaches in a New Delhi hospital. In addition, evidence suggests that cockroaches spread typhoid, disentery, and leprosy organisms.2