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The majority of people who are infected have no visible symptoms
Mosquitoes pick up the malaria parasite (Plasmodium) from the blood of infected people when it bites them, it can then transmit the parasite to other people.
According to the US CDC the primary vector for the transmission of the zika virus are infected Aedes species mosquitos (Ae. aegypti and Ae. albopictus). Other vectors are infected mothers who transmit it to their unborn children, infected men who may transmit it to their sexual partners, blood transfusions from infected people, and (very rarely) exposure in a laboratory where research is being performed on the virus.
While the majority of people infected with arbovirus never become sick, those who develop Japanese encephalitis become very ill. Some outbreaks have a 50% death rate.
It is excreted in the feces of infected people and enters the mouth of others when they ingest contaminated foods.
Yes. The vast majority of dogs do not have rabies, but any wound that breaks the skin, regardless of the cause, can become infected, and rabies is not the only disease that animals can transmit. Even ignoring infectious disease, a large dog can seriously wound a person in an attack and a few people have been killed outright.
The risk of acquiring HIV infection through kissing is very small. However, people who are not receiving proper therapy can become infected with the virus and transmit it to others. The risk of acquiring a herpes virus infection through kissing is much greater and herpes virus infection is not as harmless as was once believed.
If infected people do not develop symptoms there will be no easy way to know who is infected, therefore, infected people will not be treated or quarantined and will be free to spread the disease to other people.
Because sometimes, people have sickness like Cancer, HIV, Aids and others. If they share blood with other people they might get infected with that disease too.
they got infected by rats