Contagious Diseases. Most common and dangerous Contagious Diseases.

A contagious disease is a subset category of transmissible diseases, which are transmitted to other persons, either by physical contact with the person suffering the disease, or by casual contact with their secretions or objects touched by them or airborne route among other routes. There are some contagious diseases which are only transmitted by sexual intercourse. Such types of diseases are called Sexually Transmitted Diseases (STDs). Here, in this article we are discussing the most common diseases which are easily transmissible from one person to another.

Chicken Pox

Chickenpox is a very contagious disease caused by the varicella-zoster virus (VZV). It causes a blister-like rash, itching, tiredness, and fever. The rash appears first on the stomach, back and face and can spread over the entire body causing between 250 and 500 itchy blisters. Chickenpox can be serious, especially in babies, adults, and people with weakened immune systems. The best way to prevent chickenpox is to get the chickenpox vaccine.

Common Cold

The Centers for Disease Control and Prevention reports the loss of 22 million school days yearly in the United States because of the common cold. Viral agents that produce the common cold include the 110 rhinoviruses, parainfluenza, adenoviruses, echovirusus and respiratory syncytial virus. The common cold is highly contagious by inhalation of expelled mucous cold germs in the air and by transferring the viral germs from any surface to the eyes or nose.


Influenza viruses cause highly contagious respiratory illnesses known as the flu. The CDC reports that as many as 20 percent of the people in the United States have the flu every year. Of these, about 36,000 die. Symptoms for respiratory influenza include fever, fatigue, cough, runny nose and aching muscles. Stomach symptoms may include nausea, vomiting and diarrhea. The flu spreads by contact and through coughing and sneezing. Influenza is contagious before symptoms develop and up to seven days after becoming ill.

Strep Throat

Strep throat is a highly contagious disease caused by the Group A Streptococcus bacteria. The National Institutes of Health reports strep throat as the most common bacterial throat infection. Symptoms that include sore throat, nausea, fever and chills generally appear between two and five days of exposure. The prognosis with antibiotic treatment is good. Lack of antibiotic intervention can lead to complications such as rheumatic or scarlet fever, ear infection and kidney disease.


Ringworm, a contagious fungal skin infection, presents as ring-shaped patches. Tinea capitis, or scalp ringworm, is a highly contagious form of ringworm seen mostly in children. Scalp ringworm presents as an itchy, pink rash or an area of hair loss with no rash. Body ringworm–tinea corporis–appears on the face, arms, legs and body as round, pink patches with clear centers. Close body contact provides a medium for spreading from person to person.


The Mayo Clinic reports giardiasis, a highly contagious intestinal parasitic infection, as one of the most common waterborne disease in America. Modes of transmission include infested swimming pools, spas and person-to-person contact. Expect treatment by drugs such as metronidazole or tinidazole when symptoms appear.


Tuberculosis (TB) is caused by bacteria (Mycobacterium tuberculosis) that most often affect the lungs. Tuberculosis is curable and preventable. TB is spread from person to person through the air. When people with lung TB cough, sneeze or spit, they propel the TB germs into the air.


Staphylococcal infections

Staphylococcal infections are a group of infections caused by the bacterium Staphylococcus. You may have heard them referred to as “staph infections”. Staph bacteria can cause a wide range of infections, from relatively minor skin infections such as boils, to more serious infections of the blood, lungs and heart.

H7N9 Influenza A:

H7N9 is a bird flu strain of the species Influenza virus A (avian influenza virus or bird flu virus). Avian influenza A H7 viruses normally circulate amongst avian populations with some variants known to occasionally infect humans. An H7N9virus was first reported to have infected humans in March 2013, in China.

H5N1 Influenza:

Influenza A virus subtype H5N1, also known as A(H5N1) or simply H5N1, is a subtype of theinfluenza A virus which can cause illness in humans and many other animal species. This is also a highly contagious disease which wraps communities at a movements.

Scarlet Fever:

Scarlet fever, also known as scarlatina, is an infection that can develop in people who have strep throat. It’s characterized by a bright red rash on the body, usually accompanied by a high fever and sore throat. The same bacteria that causes strep throat also causes scarlet fever.

The contagious period for scarlet fever ranges from about 12 hours after exposure to the bacteria, even if the individual shows no symptoms, and during the acute phase when the person has a rash and fever; it ends after the fever has gone away for at least 12 hours.


Infectious mononucleosis, also known as mono, refers to a group of symptoms usually caused by the Epstein-Barr virus (EBV). It typically occurs in teenagers, but you can get it at any age. The virus is spread through saliva, which is why some people call it “the kissing disease.”

HIV Aids:

Unlike common diseases like colds, flu, measles or chicken pox, HIV is not highly contagious. It is NOT transmitted through touching, hugging, sneezing, coughing, eating or drinking from common utensils, or being around an infected person. However HIV aids is not excluded from contagious disease, because this disease can spread from one person to another through intimate contact like sexual copulation. If the sexual contact remains among a group of individuals, and if a member of that group is already suffering from HIV aids, the disease will transmit to all the members of the group. Moreover an infected person can spread the disease to a person whom he/she copulates with.





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