A urinary tract infection (UTI) is a bacterial infection that affects any part of the urinary tract. Although urine contains a variety of fluids, salts, and waste products, it usually does not have bacteria in it. When bacteria get into the bladder or kidney and multiply in the urine, they cause a UTI. The most common type of UTI is a bladder infection which is also often called cystitis. Another kind of UTI is a kidney infection, known as pyelonephritis, and is much more serious. Although they cause discomfort, urinary tract infections are usually quickly and easily treated by seeing a doctor promptly.
Typhus Saturday, Jun 2 2007
Bacterial 10:52 pm
Typhus is any one of several similar diseases caused by louse-borne bacteria. The name comes from the Greek typhos, meaning smoky or lazy, describing the state of mind of those affected with typhus. Rickettsia is endemic in rodent hosts, including mice and rats, and spreads to humans through mites, fleas and body lice. The insects often flourish under conditions of poor hygiene, such as those found in prisons or refugee camps, amongst the homeless, or until the middle of the 20th century, in armies in the field. In tropical countries, typhus is often mistaken for dengue fever.
Typhoid fever Saturday, Jun 2 2007
Bacterial 10:51 pm
Typhoid fever, also known as enteric fever, is an illness caused by the bacterium Salmonella typhi. Common worldwide, it is transmitted by ingestion of food or water contaminated with feces from an infected person. The bacteria then multiply in the blood stream of the infected person and are absorbed into the digestive tract and eliminated with the waste.
Tularemia Saturday, Jun 2 2007
Bacterial 10:51 pm
Tularemia (also known as “rabbit fever”) is a serious infectious disease caused by the bacterium Francisella tularensis. The disease is endemic in North America, and parts of Europe and Asia. The primary vectors are ticks and deer flies, but the disease can also be spread through other arthropods. Animals such as rabbits, hares and muskrats serve as reservoir hosts. The disease is named after Tulare County, California.
Tuberculosis Saturday, Jun 2 2007
Bacterial 10:51 pm
Tuberculosis (abbreviated as TB for Tubercle Bacillus) is a common and deadly infectious disease that is caused by mycobacteria, primarily Mycobacterium tuberculosis. Tuberculosis most commonly affects the lungs (as pulmonary TB) but can also affect the central nervous system, the lymphatic system, the circulatory system, the genitourinary system, bones, joints and even the skin. Other mycobacteria such as Mycobacterium bovis, Mycobacterium africanum, Mycobacterium canetti and Mycobacterium microti can also cause tuberculosis, but these species do not usually infect healthy adults.
Over one-third of the world’s population now has the TB bacterium in their bodies and new infections are occurring at a rate of one per second. Not everyone who is infected develops the disease and asymptomatic latent TB infection is most common. However, one in ten latent infections will progress to active TB disease which, if left untreated, kills more than half of its victims. In 2004, 14.6 million people had active TB and there were 8.9 million new cases and 1.7 million deaths, mostly in developing countries. A rising number of people in the developed world contract tuberculosis because their immune systems are compromised by immunosuppressive drugs, substance abuse or HIV/AIDS.
The rise in HIV infection levels and the neglect of TB control programs have enabled a resurgence of tuberculosis. Drug-resistant strains of TB have emerged and are spreading (in 2000–2004, 20% of cases were resistant to standard treatments and 2% were also resistant to second-line drugs). TB incidence varies widely, even in neighboring countries, and this appears to be caused by differences in healthcare. The World Health Organization declared TB a global health emergency in 1993, and the Stop TB Partnership proposed a Global Plan to Stop Tuberculosis which aims to save 14 million lives between 2006 and 2015.
Chlamydia Saturday, Jun 2 2007
Bacterial 10:50 pm
Chlamydia is a common term for infection with any bacterium belonging to the phylum Chlamydiae. This term derives from the name of the bacterial genus Chlamydia in the family Chlamydiaceae, order Chlamydiales, class and phylum Chlamydiae, ultimately from Greek χλαμύδος “cloak”. There are two genera in Chlamydiaceae: Chlamydia and Chlamydophila. The genus Chlamydia includes three species: C. trachomatis, C. muridarum, and C. suis. C. trachomatis infection is described below.
Chlamydia trachomatis is a major infectious cause of human eye and genital disease. C. trachomatis is naturally found living only inside human cells and is one of the most common sexually transmitted infections in people worldwide — about four million cases of chlamydia infection occur in the United States each year. Not all infected people exhibit symptoms of infection. About half of all men and three-quarters of all women who have chlamydia have no symptoms and do not know that they are infected. It can be serious but is easily cured with antibiotics if detected in time. Equally important, chlamydia infection of the eye is the most common cause of preventable blindness in the world. Blindness occurs as a complication of trachoma (chlamydia conjunctivitis).
There are many other species of Chlamydiae that live in the cells of animals (including humans), insects, or protozoa. Two of these species cause lung infection in humans: Chlamydophila pneumoniae and Chlamydophila psittaci. Both of these species previously belonged to the genus Chlamydia.
Tetanus Saturday, Jun 2 2007
Bacterial 10:50 pm
Tetanus is a medical condition that is characterized by a prolonged contraction of skeletal muscle fibers. The primary symptoms are caused by tetanospasmin, a neurotoxin produced by the Gram-positive, obligate anaerobic bacterium Clostridium tetani. Infection generally occurs through wound contamination, and often involves a cut or deep puncture wound. As the infection progresses, muscle spasms in the jaw develop hence the common name, lockjaw. This is followed by difficulty swallowing and general muscle stiffness and spasms in other parts of the body. Infection can be prevented by proper immunization and by post-exposure prophylaxis.
The clinical manifestations of tetanus are caused when tetanus toxin blocks inhibitory nerve impulses, by interfering with the release of neurotransmitters. This leads to unopposed muscle contraction and spasm. Seizures may occur, and the autonomic nervous system may also be affected. The term tetany refers to sustained muscle contraction that is not caused by tetanus.
Syphilis Saturday, Jun 2 2007
Bacterial 10:49 pm
Syphilis is a sexually transmitted disease (STD), caused by spiral-shaped spirochete bacterium, Treponema pallidum. The disease has been known under many names during history, including the “French disease” and the “Great Pox”. Syphilis has had a prominent role in history and literature for the last several hundred years.
The route of transmission of syphilis is almost always by sexual contact. However, there are examples of congenital syphilis via transmission from mother to child in utero. The signs and symptoms of syphilis are numerous; before the advent of serological testing, precise diagnosis was very difficult. In fact, the disease was dubbed the “Great Imitator” because it was often confused with other diseases.
Syphilis can be easily treated with antibiotics including penicillin. The oldest, and still most effective, method is an intramuscular injection of benzathine penicillin. If not treated, syphilis can cause serious effects such as damage to the heart, aorta, brain, eyes, and bones. In some cases these effects can be fatal. In 1998, the complete genetic sequence of T. pallidum was published which may aid understanding of the pathogenesis of syphilis.
Shigellosis Saturday, Jun 2 2007
Bacterial 10:49 pm
Shigellosis, also known as bacillary dysentery in its most severe manifestation, is a foodborne illness caused by infection by bacteria of the genus Shigella. It accounts for less than 10% of the reported outbreaks of foodborne illness in the USA. Shigellosis rarely occurs in animals; it is principally a disease of humans and primates such as monkeys and chimpanzees. The causative organism is frequently found in water polluted with human feces, and is transmitted via the fecal-oral route.
Group A streptococcal infection Saturday, Jun 2 2007
Bacterial 10:49 pm
The group A streptococcus bacterium (Streptococcus pyogenes, or GAS) is a form of Streptococcus bacteria responsible for most cases of streptococcal illness. Other types (B, C, D, and G) may also cause infection. Several virulence factors contribute to the pathogenesis of GAS, such as M protein, hemolysins, and extracellular enzymes.
