Malaria is caused by four different species: Plasmodium falciparum, P. malariae, P. ovale and P. vivax. The disease causes anemia in sufferers.Know More
Between 300 and 500 million people a year are infected with malaria, and 1 million die a year from the disease. P. falciparum causes the most severe form of the disease, but malaria is most commonly caused by P. vivax.
The Anopheles mosquito carrying a Plasmodium species bites a human. This process introduces the sporozoites of the malarial protist into the human body. These sporozoites enter the hepatocytes, the liver cells, and multiply. The progeny of the sporozoites, called merozoites, then enter the bloodstream to infect the red blood cells. The red blood cells are then destroyed by the merozoites, thus releasing the merozoites and causing anemia.
According to WebMD, cold sores are caused by the herpes simplex virus, which is contagious. The virus is contagious via direct or indirect oral contact, which means that it may be spread by kissing, sharing cups or utensils, or sharing hygiene supplies such as towels and razors.Full Answer >
Coughs are caused by flus and colds, which are triggered by viruses; allergies and asthma as the lungs react to allergens; irritants such as perfumes, cigar smoke and cold air; acid reflux when stomach acids irritate the trachea; sleep apnea; lung inflammation; and drug reactions, according to WebMD. A cough is a protective reaction, as it tries to remove particles that are foreign in the trachea or lungs.Full Answer >
A cold is caused by a virus, implying that it has no proven cure. Alleviate symptoms by taking hot fluids, such as warm lemon water, tea, coffee and chocolate; taking immunity-boosting dietary supplements; taking a steamy shower and relaxing; taking over-the-counter drugs, such as pain killers, decongestants and suppressants; and blowing your nose, states WebMD. Gargle using fluids such as warm salt water to moisten and relax your sore throat.Full Answer >
Viral illnesses, asthma, allergies, bronchospasm and exposure to respiratory irritants are among the main causes of dry cough, according to WebMD. Dry cough is defined as a cough that does not bring up any mucus. Someone with a viral illness may have a dry cough for several weeks after other symptoms dissipate. The cough typically worsens at night.Full Answer >