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Bacteria are prokaryotes (unicellular organisms with no membrane-enclosed nucleus) with simple structures that typically range in size from about 0.5 to 20 micrometers. |
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Anthrax
Anthrax is an infectious disease caused by bacteria called Bacillus anthracis. Infection in humans most often involves the skin, the gastrointestinal tract, or the lungs.
Anthrax is an infectious disease caused by bacteria called Bacillus anthracis. Infection in humans most often involves the skin, the gastrointestinal tract, or the lungs.
MRSA Infections
Methicillin-resistant Staphylococcus aureus (MRSA) is a bacterial infection that is highly resistant to some antibiotics.
Diphtheria
Diphtheria is an acute infectious disease caused by the bacteria Corynebacterium diphtheriae.
Diphtheria is an acute infectious disease caused by the bacteria Corynebacterium diphtheriae.
Gonorrhea
Gonorrhea is one of the most common sexually transmitted diseases (STD). It is a bacterial infection that is highly contagious and can be transmitted by any form of intimate contact.
Legionnaires' Disease
Legionnaire's disease is an acute respiratory infection caused by Legionella bacteria.
Legionnaire's disease is an acute respiratory infection caused by Legionella bacteria.
Q Fever
Q fever is a bacterial infection that can affect the lungs, liver, heart, and other parts of the body.
Q fever is a bacterial infection that can affect the lungs, liver, heart, and other parts of the body.
Rheumatic Fever
Rheumatic fever is an inflammatory disease that may develop after an infection with Streptococcus bacteria (such as strep throat or scarlet fever.
Scarlet Fever
Scarlet fever is a disease caused by infection with the group A Streptococcus bacteria (the same bacteria that causes strep throat.
Scarlet fever is a disease caused by infection with the group A Streptococcus bacteria (the same bacteria that causes strep throat.
Syphilis
Syphilis is a sexually transmitted disease (STD) and a bacterial infection. You don't have to have intercourse to get syphilis.
Syphilis is a sexually transmitted disease (STD) and a bacterial infection. You don't have to have intercourse to get syphilis.
Tetanus
Tetanus is a potentially deadly nervous system disease due to the bacteria Clostridium tetani (C. tetani.
Tuberculosis
Tuberculosis (TB) is a potentially fatal contagious disease that can affect almost any part of the body but is mainly an infection of the lungs.
Tuberculosis (TB) is a potentially fatal contagious disease that can affect almost any part of the body but is mainly an infection of the lungs.
Tularemia
Tularemia is an infection common in wild rodents. It is transmitted to humans by contact with infected animal tissues or by ticks, biting flies, and mosquitoes.
Tularemia is an infection common in wild rodents. It is transmitted to humans by contact with infected animal tissues or by ticks, biting flies, and mosquitoes.
H. Pylori Infection
Helicobacter pylori (H. pylori) is the bacteria responsible for most ulcers and many cases of stomach inflammation (chronic gastritis.
Helicobacter pylori (H. pylori) is the bacteria responsible for most ulcers and many cases of stomach inflammation (chronic gastritis.
Strep Throat
Strep throat is caused by Group A Streptococcus bacteria. It is the most common bacterial infection of the throat.
Strep throat is caused by Group A Streptococcus bacteria. It is the most common bacterial infection of the throat.
Brucellosis
Brucellosis is an infectious disease caused by contact with animals carrying a bacteria called Brucella.
Brucellosis is an infectious disease caused by contact with animals carrying a bacteria called Brucella.
Cat Scratch Fever
Cat scratch disease is an infectious illness caused by the bacteria bartonella. It is believed to be transmitted by cat scratches, bites, or exposure to cat saliva.
Cat scratch disease is an infectious illness caused by the bacteria bartonella. It is believed to be transmitted by cat scratches, bites, or exposure to cat saliva. 
Colorado Tick Fever
Colorado tick fever is an acute viral infection spread by the bite of the Dermacentor andersoni (wood) tick.
Colorado tick fever is an acute viral infection spread by the bite of the Dermacentor andersoni (wood) tick.
Granuloma Inguinale
Granuloma inguinale is a sexually transmitted disease that is rarely seen in the United States.
Granuloma inguinale is a sexually transmitted disease that is rarely seen in the United States.
Salmonella Food Poisoning
Salmonella enterocolitis is an infection in the lining of the small intestine caused by Salmonella bacteria.
Salmonella enterocolitis is an infection in the lining of the small intestine caused by Salmonella bacteria.
Salivary Gland Infection
Salivary gland infections are viral or bacterial infections of the saliva-producing glands. There are three pairs of major salivary glands.
Salivary gland infections are viral or bacterial infections of the saliva-producing glands. There are three pairs of major salivary glands.
Meningeal Tuberculosis
Tuberculous meningitis is an infection of the the membranes covering the brain and spinal cord (meninges.
Tuberculous meningitis is an infection of the the membranes covering the brain and spinal cord (meninges.
Secondary Syphilis
Secondary syphilis is the second stage of the sexually transmitted disease syphilis. This stage is the most contagious.
Secondary syphilis is the second stage of the sexually transmitted disease syphilis. This stage is the most contagious.
Neurosyphilis
Neurosyphilis is an infection of the brain or spinal cord. It occurs in persons with untreated syphilis many years after they are first infected.
Neurosyphilis is an infection of the brain or spinal cord. It occurs in persons with untreated syphilis many years after they are first infected.
Nocardia Infection
Nocardia infection is a rare disorder affecting the lungs, brain, or skin. It occurs mainly in people with weakened immune systems.
Nocardia infection is a rare disorder affecting the lungs, brain, or skin. It occurs mainly in people with weakened immune systems.
Staphylococcus Aureus Food Poisoning
Staph aureus food poisoning is an illness that results from eating food contaminated with a toxin produced by the Staphylococcus aureus bacteria.
Pneumococcal Meningitis
Pneumococcal meningitis is a bacterial inflammation or infection of the membranes covering the brain and spinal cord.
Pneumococcal meningitis is a bacterial inflammation or infection of the membranes covering the brain and spinal cord.
Meningococcemia
Meningococcemia is an acute and potentially life-threatening infection of the bloodstream that commonly leads to inflammation of the blood vessels (vasculitis. See also: Septicemia
Staphylococcal Meningitis
Staphylococcal meningitis is a bacterial infection of the membranes covering the brain and spinal cord (meninges.
Staphylococcal meningitis is a bacterial infection of the membranes covering the brain and spinal cord (meninges.
Systemic Gonococcal Infection
Visit the Systemic Gonococcal Infection Learning Center to understand its Causes, Symptoms, Treatments and more.
Syphilitic Meningitis
Syphilitic aseptic meningitis is a complication of untreated syphilis that involves inflammation of the tissues covering the brain and spinal cord.
Syphilitic aseptic meningitis is a complication of untreated syphilis that involves inflammation of the tissues covering the brain and spinal cord.
E. Coli Infection
E. coli enteritis is inflammation of the small intestine from Escherichia coli (E. coli) bacteria. It is the most common cause of travelers' diarrhea.
E. coli enteritis is inflammation of the small intestine from Escherichia coli (E. coli) bacteria. It is the most common cause of travelers' diarrhea.
Chlamydia
Chlamydia is a disease caused by the bacteria Chlamydia trachomatis. It is most commonly sexually transmitted.
Chlamydia is a disease caused by the bacteria Chlamydia trachomatis. It is most commonly sexually transmitted. 
Actinomycosis
Actinomycosis is a long-term (chronic) bacterial infection that commonly affects the face and neck.
Actinomycosis is a long-term (chronic) bacterial infection that commonly affects the face and neck.
Chlamydia Infections
Chlamydia is a disease caused by the bacteria Chlamydia trachomatis. It is most commonly sexually transmitted.
Chlamydia is a disease caused by the bacteria Chlamydia trachomatis. It is most commonly sexually transmitted.
Cholera
Cholera is an infection of the small intestine that causes a large amount of watery diarrhea.
Cholera is an infection of the small intestine that causes a large amount of watery diarrhea. Topics
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