Not allergic but people having negative blood group cannot take positive blood as there body takes rh+ factor to be foreign object and treats it as a bacteria or virus.
HIV is only transmitted by five bodily fluids: blood, semen, preseminal fluid, vaginal fluid, and breast milk. Any of those fluids from an infected host getting into the body of another person can transmit HIV. No other fluids (saliva, urine, etc.) from the body transmit HIV.
There is no "body pH." Different fluids of the body have different pH.
By having sex, sharing needles or doing something else that transfers body fluids from one person and into the other.
No, the malaria parasite must transit through a mosquito between humans hosts.
Infectious
In that one person is infected by another, then infects a third person, who then goes on to infect another person, yes, HIV is a chain reaction. It is spread through human conctact and transmission of the virus through the blood and body fluids.
Yes. To get HIV it takes body fluids.
Because it is easily spread from person to person through contact with body fluids.
No. AIDS is transmitted by human body fluids, such as blood, semen, etc.
The study of bodily fluids is Serology.
It can get into a body by injection or ingestion. It is not transmitted from one person to another.
Ebola occurs through skin contact with an infected person or his or her body fluids, feces, body fluids, secretions, needles, by eating animals with virus, and contact with objects.