Yes, when untreated. However, even the most contagious patient becomes non-infectious within a few days or weeks of treatment. In addition, very few persons exposed to untreated patients contract the disease because only about five percent of the world's population is even susceptible to it.

Gastrointestinal illness (gastroenteritis) is the inflammation of the stomach and small and large intestines. The main symptoms include vomiting and watery diarrhea. Other symptoms include fever, abdominal cramps, nausea, and headache. Infections causing gastroenteritis can be viral, bacterial, or parasitic in origin. Norovirus is a common cause of viral gastroenteritis found on cruise ships. Types of bacterial gastroenteritis infections include Escherichia coli and salmonella.

HFMD is moderately infectious. It can spread from one person to another through direct contact with discharge from the nose and throat, saliva, infected stools, or fluid from a blister.

Leprosy is a chronic, infectious disease caused by a germ, Mycobacterium leprae. It usually involves the nerves, skin and eyes.

Infections causing gastroenteritis can be spread by contaminated food or water or through an infected food handler. Individuals who are symptomatic with gastroenteritis can spread illness to others by touching handrails, elevator buttons, and shared utensils, as well as through direct intimate contact with others while they are ill.

Yes. You can reduce your chance of becoming ill by washing your hands more frequently, keeping your hands away from your mouth, and avoiding any food or water that is thought to have been contaminated. When a higher than expected number of passengers or crew become sick, ships implement additional cleaning procedures and use disinfectants that are targeted to stop the illness. More information on handwashing tips and techniques.

Available information suggests that persons with SARS are most likely to be contagious only when they have symptoms, such as fever or cough. Patients are most contagious during the second week of illness. However, as a precaution against spreading the disease, CDC recommends that persons with SARS limit their interactions outside the home (for example, by not going to work or to school) until 10 days after their fever has gone away and their respiratory (breathing) symptoms have gotten better.

The General Infectious Diseases Clinic is a clinic which sees patients with a variety of suspected or proven infectious diseases. Please see the following questions for our exceptions.

Leprosy is transmitted by direct, person-to-person contact, usually repetitive, over a prolonged period of time.

In 2000, 738,284 cases of leprosy were identified worldwide; 91 in the United States. Between 1 million and 2 million people are believed permanently disabled by the disease. Ten countries account for 90 percent of cases: Brazil, Democratic Republic of the Congo,Guinea, India, Indonesia, Madagascar, Mozambique, Myanmar, Nepal and Tanzania.

Leprosy is a chronic disease caused by a bacillus, mycobacterium leprae. Mycobacterium leprae multiplies very slowly. The incubation period is about three to five years but signs and symptoms can take as long as 20 years to appear. Leprosy is not highly infectious. It is transmitted via droplets from the nose and mouth or via the skin during close and frequent contact with untreated, infected persons.

Leprosy is a curable disease and when treated in the early stages, disability can be avoided. With minimal training, leprosy can be easily diagnosed on clinical signs alone. A World Health Organization (WHO) Study Group recommended multidrug therapy (MDT) in 1981, in place of monotherapy with dapsone.

Currently less than 300,000 people develop leprosy each year. Since the introduction of MDT in the early 1980s, more than 15 million people around the world have been cured of the disease. Today, it remains a public health problem in only a handful of countries. top