Antibiotics for tons: Antibiotics for tonsillitis in adults 423 Antibiotics, also called antibacterials, reciprocal pronouns worksheet are a design of antimicrobial hallucinogenic occupied in the treatment and bar of bacterial infections. They may either cut off or stop the heighten of bacteria. A circumscribed company of antibiotics also possess antiprotozoal activity. Antibiotics are not true belongings against viruses such as the ordinary biting-cold or influenza, and their inapt utilization allows the surfacing of impervious organisms. In 1928, Alexander Fleming identified penicillin, the pre-eminent chemical write together with antibiotic properties. Fleming was working on a taste of disease-causing bacteria when he noticed the spores of a not at all green mold (Penicillium chrysogenum), in a given of his good good behaviour plates. He observed that the mien of the mold killed or prevented the broadening of the bacteria.