This volume is written especially for health professionals affiliated with hospitals, veterinary clinics, dental offices, dental laboratories, toxicological testing laboratories, and pharmaceutical laboratories as a contribution to attain security in such working environments. Possible hazards in the working environments for the health professionals are discussed, followed by recommendations of the various precautions that may be taken to avoid these hazards. The possible hazards in hospitals discussed are ergonomics, physical hazards, chemical hazards, and bacteriological risks. The ergonomics, chemical hazards, and bacteriological risks for dental offices and veterinary clinics are also explained.