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Infections, viruses, parasites

Infectious diseases are caused by pathogenic microorganisms, such as bacteria, viruses, parasites or fungi. Infectious diseases can be spread, directly or indirectly, from one person to another.

Infections, Parasites by Supreme Pharmatech



Infectious diseases are a leading cause of death worldwide, particularly in low income countries, especially in young children.
Three infectious diseases were ranked in the top ten causes of death worldwide in 2016 by the World Health Organization. They are lower respiratory infections (3.0 million deaths), diarrheal diseases (1.4 million deaths), and tuberculosis (1.3 million deaths). HIV/AIDS, which was previously on the list, has dropped from the global list of the top ten causes of death (1.0 million deaths in 2016 compared with 1.5 million in 2000), but it is still a leading cause of death in low income countries. Another infectious disease, malaria, accounts for a top cause of death in low income countries.
Approximately half of all deaths caused by infectious diseases each year can be attributed to just three diseases: tuberculosis, malaria, and AIDS. Together, these diseases cause over 300 million illnesses and more than 5 million deaths each year.

African Trypanosomiasis (sleeping sickness)

African trypanosomiasis is spread by the tsetse fly, which is common to many African countries. The World Health Organization (WHO) estimates that nearly 450,000 cases occur each year. Symptoms of the disease include fever, headaches, joint pains, and itching in the early stage, and confusion, sensory disturbances, poor coordination, and disrupted sleep cycles in the second stage. If the disease goes untreated in its first stage, it causes irreparable neurological damage; if it goes untreated in its second stage, it is fatal.


Cholera is a disease spread mostly through contaminated drinking water and unsanitary conditions. It is endemic in the Indian subcontinent, Russia, and sub-Saharan Africa. It is an acute infection of the intestines with the bacterium Vibrio cholerae. Its main symptom is copious diarrhea. Between 5% and 10% of those infected with the disease will develop severe symptoms, which also include vomiting and leg cramps. In its severe form, cholera can cause death by dehydration. An estimated 200,000 cases are reported to WHO annually.


Cryptosporidiosis has become one of the most common causes of waterborne disease in the United States in recent years; it is also found throughout the rest of the world. It is caused by a parasite that spreads when a water source is contaminated, usually with the feces of infected animals or humans. Symptoms include diarrhea, stomach cramps, an upset stomach, and slight fever. Some people do not exhibit any symptoms.


WHO estimates that 50 million cases of dengue fever appear each year. It is spread through the bite of the Aedes aegypti mosquito. Recent years have seen dengue outbreaks all over Asia and Africa. Dengue fever can be mild to moderate, and occasionally severe, though it is rarely fatal. Mild cases, which usually affect infants and young children, involve a nonspecific febrile illness, while moderate cases, seen in older children and adults, display high fever, severe headaches, muscle and joint pains, and rash. Severe cases develop into dengue hemorrhagic fever, which involves high fever, hemorrhaging, and sometimes circulatory failure.

Hepatitis A

Hepatitis A is a highly contagious liver disease caused by the hepatitis A virus. Spread primarily by the fecal-oral route or by ingestion of contaminated water or food, the number of annual infections worldwide is estimated at 1.4 million. Symptoms include fever, fatigue, jaundice, and dark urine. Although those exposed usually develop lifelong immunity, the best protection against Hepatitis A is vaccination.

Hepatitis B

Approximately 2 billion people are infected with the hepatitis B virus (HBV), making it the most common infectious disease in the world today. Over 350 million of those infected never rid themselves of the infection. Hepatitis is an inflammation of the liver that causes symptoms such as jaundice, extreme fatigue, nausea, vomiting, and stomach pain; hepatitis B is the most serious form of the disease. Chronic infections can cause cirrhosis of the liver or liver cancer in later years.

Hepatitis C

Hepatitis C is a less common, and less severe, form of hepatitis. An estimated 180 million people worldwide are infected with hepatitis C virus (HCV); 3-4 million more are infected every year. The majority of HCV cases are asymptomatic, even in people who develop chronic infection.


Acquired Immune Deficiency Syndrome, or AIDS, was first reported in mid-1981 in the United States; it is believed to have originated in sub-Saharan Africa. The human immunodeficiency virus (HIV) that causes AIDS was identified in 1983, and by 1985 tests to detect the virus were available. The credit for discovering the AIDS virus is jointly shared by Dr. Robert Gallo, a researcher at the National Cancer Institute, and Luc Montagnier of the Pasteur Institute, France.

A fatal and incurable disease caused by HIV, AIDS attacks and destroys the immune system, gradually leaving the individual defenseless against illnesses that lead to death. These illnesses are referred to as “opportunistic“ infections or diseases: in AIDS patients the most common are Pneumocystis carinii pneumonia (PCP), a parasitic infection of the lungs, and a type of cancer known as Kaposi's sarcoma (KS). Other opportunistic infections include unusually severe infections with yeast, cytomegalovirus, herpes virus, and parasites such as Toxoplasma or Cryptosporidia. Milder infections with these organisms do not suggest immune deficiencies. Symptoms of full-blown AIDS include a persistent cough, fever, and difficulty in breathing. Multiple purplish blotches and bumps on the skin may indicate Kaposi's sarcoma. The virus can also cause brain damage.

People infected with the virus can have a wide range of symptoms-from none to mild to severe. At least a fourth to a half of those infected with HIV will develop AIDS within four to ten years. Many experts think the percentage will grow much higher.

On a global scale, more than 37 million people have died to date. There are just under 37 million people living with HIV, including 2.6 million children, most of whom live in sub-Saharan Africa and were infected by their HIV-positive mothers during pregnancy, childbirth, or breastfeeding. Each day more than 650 children become newly infected with HIV. At the end of 2014, 15 million HIV-positive people were receiving antiretroviral treatment (ART) worldwide. However, that leaves almost 22 million still not accessing ART.


Several influenza epidemics in the 20th century caused millions of deaths worldwide, including the worst epidemic in American history, the Spanish influenza outbreak that killed more than 500,000 in 1918. Today influenza is less of a public health threat, though it continues to be a serious disease that affects many people. Approximately 20,000 people die of the flu in the United States every year. The influenza virus attacks the human respiratory tract, causing symptoms such as fever, headaches, fatigue, coughing, sore throat, nasal congestion, and body aches.

Japanese Encephalitis

Japanese encephalitis is a mosquito-borne disease endemic in Asia. Around 50,000 cases occur each year; 25% to 30% of all cases are fatal.


Leishmaniasis is a disease spread by the bite of the sandfly. It is found mostly in tropical countries. There are several types of leishmaniasis, and they vary in symptoms and severity. Visceral leishmaniasis (VL, or kala azar) is the most severe; left untreated, it is always fatal. Its symptoms include fever, weight loss, anemia, and a swelling of the spleen and liver. Mucocutaneous leishmaniasis (MCL, or espundia) produces lesions that affect the nose, mouth, and throat and can destroy their mucous membranes. Cutaneous leishmaniasis (CL) produces skin ulcers, sometimes as many as 200, that cause disability and extensive scarring. Diffuse cutaneous leishmaniasis (DCL) is similar to CL, and infected people are prone to relapses. Approximately 12 million cases of leishmaniasis exist today.


Malaria is a mosquito-borne disease that affects more than 500 million people annually, causing between 1 and 3 million deaths. It is most common in tropical and subtropical climates and is found in 90 countries-but 90% of all cases are found in Sub-Saharan Africa. Most of its victims are children. The first stage consists of shaking and chills, the next stage involves high fever and severe headache, and in the final stage the infected person's temperature drops and he or she sweats profusely. Infected people also often suffer from anemia, weakness, and a swelling of the spleen. Malaria was almost eradicated 30 years ago; now it is on the rise again.


Measles is a disease that has seen a drastic reduction in countries where a vaccine is readily available, but it is still prevalent in developing countries, where most of the 242,000 deaths (out of 30 million cases) it caused in 2006 occurred. Symptoms include high fever, coughing, and a maculo-papular rash; common complications include diarrhea, pneumonia, and ear infections.


Meningitis, often known as spinal meningitis, is an infection of the spinal cord. It is usually the result of a viral or bacterial infection. Bacterial meningitis is more severe than viral meningitis and may cause brain damage, hearing loss, and learning disabilities. An estimated 1.2 million cases of bacterial meningitis occur every year, over a tenth of which are fatal. Symptoms include severe headache, fever, nausea, vomiting, lethargy, delirium, photophobia, and a stiff neck.

Onchocerciasis (river blindness)

Onchocerciasis is caused by the larvae of Onchocerca volvulus, a parasitic worm that lives in the human body for years. It is endemic in Africa, where nearly all of the 18 million people infected with the disease live. Of those infected, over 6.5 million have developed dermatitis and 270,000 have gone blind. Symptoms include visual impairment, rashes, lesions, intense itching, skin depigmentation, and lymphadenitis.


Pneumonia has many possible causes, but it is usually an infection of the streptococcus or mycoplasma bacteria. These bacteria can live in the human body without causing infection for years, and only surface when another illness has lowered the person's immunity to disease. Streptococcus pneumoniae causes streptococcal pneumonia, the most common kind, which is more severe than mycoplasmal pneumonia. S. pneumoniae is responsible for more than 100,000 hospitalizations for pneumonia annually, as well as 6 million cases of otitis media and over 60,000 cases of invasive diseases such as meningitis.


Rotavirus is the most common cause of viral gastroenteritis worldwide. It kills more than 600,000 children each year, mostly in developing countries. Symptoms include vomiting, watery diarrhea, fever, and abdominal pain.


Schistosomiasis is a parasitic disease that is endemic in many developing countries. Roughly 200 million people worldwide are infected with the flukeworm, whose eggs cause the symptoms of the disease. Some 120 million of those infected are symptomatic, and 20 million suffer severely from the infection. Symptoms include rash and itchiness soon after becoming infected, followed by fever, chills, coughing, and muscle aches.


Shigella infection causes an estimated 600,000 deaths worldwide every year. It is most common in developing countries with poor sanitation. Shigella bacteria cause bacillary dysentery, or shigellosis. Symptoms include diarrhea with bloody stool, vomiting, and abdominal cramps.

Strep Throat

Strep throat is caused by the streptococcus bacteria. Several million cases of strep throat occur every year. Symptoms include a sore throat, fever, headache, fatigue, and nausea.


Tuberculosis causes nearly 2 million deaths every year, and WHO estimates that nearly 1 billion people will be infected between 2000 and 2020 if more effective preventive procedures are not adopted. The TB bacteria are most often found in the lungs, where they can cause chest pain and a bad cough that brings up bloody phlegm. Other symptoms include fatigue, weight loss, appetite loss, chills, fever, and night sweats.


Typhoid fever causes an estimated 600,000 deaths annually, out of 12-17 million cases. It is usually spread through infected food or water. Symptoms include a sudden and sustained fever, severe headache, nausea, severe appetite loss, constipation, and sometimes diarrhea.

Yellow Fever

Yellow fever causes an estimated 30,000 deaths each year, out of 200,000 cases. The disease has two phases. In the "acute phase," symptoms include fever, muscle pain, headache, shivers, appetite loss, nausea, and vomiting. This lasts for 3-4 days, after which most patients recover. But 15% will enter the "toxic phase," in which fever reappears, along with other symptoms, including jaundice; abdominal pain; vomiting; bleeding from the mouth, nose, eyes, and stomach; and deterioration of kidney function (sometimes complete kidney failure). Half of all patients in the toxic phase die within two weeks; the other half recover.

International Classification of Diseases and Related Health Problems 10th Revision (ICD-10): 

A00-A09 Intestinal infectious diseases
A15-A19 Tuberculosis
A20-A28 Certain zoonotic bacterial diseases
A30-A49 Other bacterial diseases
A50-A64 Infections with a predominantly sexual mode of transmission
A65-A69 Other spirochaetal diseases
A70-A74 Other diseases caused by chlamydiae
A75-A79 Rickettsioses
A80-A89 Viral infections of the central nervous system
A92-A99 Arthropod-borne viral fevers and viral haemorrhagic fevers
B00-B09 Viral infections characterized by skin and mucous membrane lesions
B15-B19 Viral hepatitis
B20-B24 Human immunodeficiency virus [HIV] disease
B25-B34 Other viral diseases
B35-B49 Mycoses
B50-B64 Protozoal diseases
B65-B83 Helminthiases
B85-B89 Pediculosis, acariasis and other infestations
B90-B94 Sequelae of infectious and parasitic diseases
B95-B98 Bacterial, viral and other infectious agents
B99-B99 Other infectious diseases 

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