It is caused by bacteria called Campylobacter. It usually occurs in the summer. It affects about one person in every one million people worldwide and about 200 people in the United States. The mosquitoes feed primarily on humans during the daytime and most frequently are found near human habitations. Dengue viruses are endemic in many countries of the Caribbean, Central and parts of tropical Africa.
Diphtheria causes inflammation of the throat, nose and tonsils, and a high fever.
It can interfere with swallowing and even cause the patient to suffocate. The infection may also produce poisons that-circulate 4n the blood and do damage to the heart, kidneys, and nervous system. About 1 person out of every 10 get diphtheria and die. H7 is a bacteria that can cause bloody diarrhea. It usually occurs in the summer.