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HLTH 101 (33)
Lecture 13

HLTH 101 Lecture 13: chap 13 pt 2

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Health Science
HLTH 101
Krish Vaidya

Epidemic- a rapidly spreading disease or health related concern Pandemic- a widespread epidemic Allergy- also called hypersensitivity. A disorder caused by the body’s exaggerated response to foreign chemicals and proteins Allergen- a substance that triggers a chemical reaction ● Chicken pox, cold sores, and other herpesvirus infections ● Herpesviruses are large group of viruses. Once infected, the host is never free of the virus. The virus lies latent within certain cells and becomes active periodically ● Varicella- zoster virus causes chickenpox and shingles ● There are several types in this group and they can infect lungs, brain, colon, and eyes ● Viral Hepatitis- in this type there are several different infections that cause inflammation of the liver. ○ Hepatitis A is transmitted by food or water contaminated by sewage or by an infected person. Hepatitis B is usually transmitted sexually ○ Hepatitis C also can be transmitted sexually or by blood transfusions ■ There are effective vaccines for HEP A and HEP B ● Hepatitis symptoms include fatigue. Jaundice- abdominal pain, loss of appetite, nausea and diarrhea. ○ Some develop chronic liver disease, cirrhosis or liver cancer ● Human Papilloma Virus (HPV)- cause a variety of warts, including common warts on hands, plantar warts on the soles of feet and genital warts. ● HPV infection is chronic and warts can reappear despite treatment ● HPV causes majority of cervical cancer ● A vaccine is recommended for girls, boys and women age 9-26 ● Treatment. Antiviral drugs typically work by interfering with some part of viral cycle. To fight the infections antivirals are available. Most other viral disease must simply run their course ● Protozoa- another group of single celled organisms known as protozoa. Malaria caused by protozoan of the plasmodium. Major killer in developing countries. 350-500 million new cases a year. 1 million deaths mostly among infants and children Emerging Infectious Diseases ● West nile virus. West nile virus is carried by birds and passed to humans when mosquitoes bite first an infected bird and then a person. Most victims have no symptoms but the virus can cause permanent brain damage or death in some ● Severe acute respiratory syndrome (SARS) It is form of pneumonia and is fatal in 5-15% of cases. It is caused by new type of coronavirus found
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