Biology homewrk question. PLEASEhelp! Its about Bacteria/disease?

Suggest why a person who has been resistant to a disease may develop it in the future?

Biology homewrk question. PLEASEhelp! Its about Bacteria/disease?
you may be resistant to a strain of bacteria...over time viruses/bacteria mutate and your t-cells, memory cells may not recognize them.... thus becoming prone for infection/disease.
Reply:her inviornment may have changed her imune system may have been weakened by a cold or somthing.
Reply:cuz the antibodi dropped below the safety level after some tym...





oh, i juz remembered... i failed my bio2...
Reply:Sudden trauma can deplete the immune system making it more susceptible to disease. Acquiring a virus may also make the body more susceptible to other diseases. For example people who have AIDS die from a variety of common diseases because their immune system has been compromised.
Reply:Here's the answer you're looking for. Check this link out:





http://www.niaid.nih.gov/factsheets/anti...
Reply:It is all about the immune system:





The most important function of the human immune system occurs at the cellular level of the blood and tissues. The lymphatic and blood circulation systems are highways for specialized white blood cells to travel around the body. White blood cells include B cells, T cells, natural killer cells, and macrophages. Each has a different responsibility, but all function together with the primary objective of recognizing, attacking and destroying bacteria, viruses, cancer cells, and all substances seen as foreign. Without this coordinated effort, a person would not be able to survive more than a few days, before succumbing to overwhelming infection.





Infections set off an alarm that alerts the immune system to bring out its defensive weapons. Natural killer cells and macrophages rush to the scene to gobble up and digest infected cells. If the first line of defense fails to control the threat, antibodies, produced by the B cells, upon the order of T helper cells, are custom-designed to hone in on the invader.





Many factors can contribute to the general weakening of the immune system:





Malnutrition (unbalanced diet / poor eating habits that cause a lack of vitamins and minerals)


Alcohol abuse


Drug abuse either intravenous or other. (Appears related to associated factors i.e. poor diet, use of infected/dirty needles, poor exercise, stress/depression)


Medications (particularly the use of anti-cancer drugs, corticosteroids, and antibiotics);


Radiation


Exposure to certain environmental toxins, whether naturally occurring or from pollution. These include:


Cigarette smoke


Stress/Depression - Research shows that psychological stress can greatly increase your susceptibility to colds and other viral diseases, namely through an increase in serum corticosteroid levels


Age - Ability of the immune system to respond is decreased at early and old age.


Decrease ability to heal due to disease or medications (i.e. Diabetes, corticosteroids, immune suppressant drugs), causing constant exposure to infectious agents without natural defense (intact skin)


Inadequate sleep at the Delta brain wave level. According to a sleep study, we need 4 hours of Delta sleep every night


Lack of exercise as well as excessive exercise resulting in physiological stress


Diseases either infectious or other causing more depression
Reply:A person who has been resistant to a disease may develop it in the future because they may have had an artifically aquired passive immunity to the disease by a vaccine. this type of immunity is called passive because the recipient's cells do not produce antibodies. This type of immunity is short term seldom lasting more than a few weeks. Furthermore, because the recipients lymphocytes might not have time to react to the pathogens for which protection was needed, susceptibility to infection may persist in the future.


Also, some bacteria and disease change because viruses genetic material change rapidy and mutate which is a great challenge for vaccines.


Basically, this questions has to do with memory cells and antibodies immune responses.
Reply:Go to yahoo search or google, and type in bateria + disease