The first photograph on the left indicates the Influenza virus strain taken from a Beijing 1993 epidemic. The caption above it reads:

• Viruses Characteristics: nonliving, replicate by inserting their genetic material into a host cell and taking over many of the host cell’s functions. Diseases Caused: common cold, influenza, chickenpox, warts. The second photograph indicates Mycobacterium that causes tuberculosis. The caption above it reads:
• Bacteria Characteristics: break down the tissues of an infected organism for food, or release toxins that interfere with normal activity in the host. Diseases Caused: streptococcus infections, diphtheria, botulism, anthrax. The third photograph indicates Trichophyton interdigitale which causes athlete’s foot. The caption above it reads:
• Fungi Characteristics: cause infections on the surface of the skin, mouth, throat, fingernails, and toenails; dangerous infections may spread from lungs to other organs. Diseases Caused: ringworm, thrush. The fourth photograph indicates Giardia intestinalis, which causes infection of the digestive tract. The caption above it reads:
• Protists Characteristics: single-celled eukaryotes may infect people through contaminated water and insect bites; they take nutrients from their host; most inflict damage to cells and tissues. Diseases Caused: malaria, African sleeping sickness, intestinal diseases.’ The last photograph indicates Trichinella spiralis, which causes trichinosis in humans. The caption above it reads:
• Parasitic Worms Characteristics: most parasites that infect humans are wormlike; may enter through the mouth, nose, anus, or skin; most reside in the intestinal tract where they absorb nutrients from the host. Diseases Caused: trichinosis, schistosomiasis, hookworm, elephantiasis.