How easily is malaria passed between humans?

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QUESTION

Can malaria be passed between humans if one has a bloody nose or if sex tears the vagina and a small bleed occurs?

ANSWER

It is extremely unlikely malaria would be transmitted via transfer of small amounts of blood. The only documented examples of direct transmission of malaria between humans is during blood transfusion, organ donation and from a mother to her unborn child, all of which require transfer of very large volumes of blood or the transfer of a specific organ containing malaria parasites. In the case of a mother transmitting malaria to her child, it either occurs across the placenta (again, via blood) or via the large amounts of blood which can be exposed during childbirth.

Malaria Transmission by Contact?

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QUESTION

If you come in contact with someone who has had malaria can you get it from them?

ANSWER

No. It is not transmissible directly between people. Most transmission of malaria occurs when a mosquito infected with the malaria parasites bites someone, who then may get malaria. In some cases, transfers of organs or large quantities of infected blood (such as during blood transfusion) may also result in transmission, though this is more rare, and screening of blood reduces the probability of it occurring. Malaria can also be transmitted from a mother if she has malaria to her unborn child via the placenta, or via blood during childbirth. This is called congenital malaria.

Ingestion of Malaria Blood

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QUESTION

If someone were to eat/ingest the blood of an infected individual would they become infected with malaria? If an infected person’s blood was on their hands and they handled food, would eating the food put others at risk for malaria?

ANSWER

No, you would not get infected with malaria, as the malaria parasites must be transmitted into a person’s blood directly in order for them to be infected. As such, most transmission only occurs via mosquitoes: when a mosquito bites a person infected with malaria, it may pick up some of the malaria parasites while it feeds on the person’s blood. When it then goes to bite another person, after the parasite has replicated and changed inside the mosquito, it can pass the malaria on to the next person, again when it bites them and drinks the person’s blood.

Additionally, in some cases malaria can be transmitted by blood transfusion or organ donation, or from a mother to her unborn baby via the placenta, or through blood passed in childbirth. If you ate/drank malaria-infected blood, the parasites would be broken down and destroyed by your stomach acid.

Is Malaria Contagious Between Humans?

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QUESTION

If someone has malaria, is it contagious?

ANSWER

No. Malaria cannot be transmitted via touching or saliva or air. In virtually all cases, it is only transmitted by the bite of an infected mosquito, and so cannot be passed from one person to another. There are a few exception—because the parasite lives in certain organs and in the blood, it can sometimes be transmitted via blood transfusion or organ transplant. It can also pass via the placenta from a mother to her unborn child, or to the child during childbirth.

Malaria: Mode of Transmission

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QUESTION

What is the mode of transmission of Malaria?

ANSWER

Malaria is transmitted normally via the bite of an infected mosquito. These mosquitoes, always female and of the genus Anopheles, carry malaria parasites in their salivary glands. The parasites, at this part of their life cycle known as sporozoites, are introduced into the host’s blood when the mosquito takes a blood meal. From there, the sporozoites travel to the liver, reproduce (this process may take several weeks), then finally re-enter the blood stream. At this point, the patient will begin to experience symptoms. Eventually, the malaria parasites change again, into gametocytes, which are picked up by another mosquito, again when it bites the infected person. In this way, the life cycle of the malaria parasite continues.

Because malaria reproduces in the blood and in the liver, in some cases malaria can be transferred via organ transplant or blood transfusion. In addition, malaria parasites can cross the placenta, and so can be transmitted from a mother to her unborn child, either in the womb or during childbirth. This is known as congenital malaria.

Transmission of Malaria from Person to Person

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QUESTION

I was in Lagos, Nigeria and i was bitten. I had stomach ache and diarrhea for a day then back to normal. Just for precaution I checked my blood and the doc said that I have a mild malaria in my blood and he gave me a medicine. If i have malaria can I affect or transmit the malaria to other people like my friends or my wife by the saliva or by any means?

ANSWER

No, you cannot directly transmit malaria to other people. It can only be transmitted via the bite of an infected mosquito; as such, while you are recovering from malaria, you should take care not to be bitten by any mosquitoes, because if these mosquitoes then went on to bite someone else, they might get infected with malaria.

Since malaria infects the blood, if large amounts of blood are transferred between people, for example during a blood transfusion, organ transplant or during childbirth, then malaria can sometimes also be transmitted. But under normal circumstances, you can not directly transfer malaria to another person.

Causes of Malaria

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QUESTION

What are the causes of malaria?

ANSWER

Malaria is caused by a parasite called Plasmodium, which is transmitted via the bites of infected mosquitoes. In the human body, the parasites multiply in the liver, and then infect red blood cells. Usually, people get malaria by being bitten by an infective female Anopheles mosquito. 

Only Anopheles mosquitoes can transmit malaria and they must have been infected through a previous blood meal taken on an infected person. When a mosquito bites an infected person, a small amount of blood is taken in which contains microscopic malaria parasites. About 1 week later, when the mosquito takes its next blood meal, these parasites mix with the mosquito’s saliva and are injected into the person being bitten.

Because the malaria parasite is found in red blood cells of an infected person, malaria can also be transmitted through blood transfusion, organ transplant, or the shared use of needles or syringes contaminated with blood. Malaria may also be transmitted from a mother to her unborn infant before or during delivery (“congenital” malaria).

Malaria Transmission

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QUESTION

How is malaria transmitted?

ANSWER

Malaria is caused by a parasite called Plasmodium, which is transmitted via the bites of infected mosquitoes. In the human body, the parasites multiply in the liver, and then infect red blood cells. Usually, people get malaria by being bitten by an infective female Anopheles mosquito. 

Only Anopheles mosquitoes can transmit malaria and they must have been infected through a previous blood meal taken on an infected person. When a mosquito bites an infected person, a small amount of blood is taken in which contains microscopic malaria parasites. About 1 week later, when the mosquito takes its next blood meal, these parasites mix with the mosquito’s saliva and are injected into the person being bitten.

Because the malaria parasite is found in red blood cells of an infected person, malaria can also be transmitted through blood transfusion, organ transplant, or the shared use of needles or syringes contaminated with blood. Malaria may also be transmitted from a mother to her unborn infant before or during delivery (“congenital” malaria).

Malaria Infectious?

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QUESTION

Is malaria infectious?

ANSWER

Yes, malaria is considered an infectious disease, though it is very rarely transmitted directly between people, and virtually all of the time must be transmitted via the bite of a mosquito (of the genus Anopheles).

Because part of the life cycle of malaria occurs in red blood cells in the human host, if sufficient amounts of blood are shared between people, for example during a blood transfusion, malaria can also pass between them this way, though screening measures reduce the likelihood of this occurring. Similarly, an earlier part of the life cycle occurs in the liver, so transplant of this organ can also result in transmission.

Finally, malaria is able to pass through the placenta, and so can be transmitted from a mother to her unborn child in this way, or also via blood during childbirth. When a baby contracts malaria from each mother, either via the placenta or during childbirth, it is known as “congenital” malaria.

Other Causes of Malaria

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QUESTION

Apart from mosquitoe bites, is there any other thing that can cause malaria or if not from mosquitoes, is there any other way someone can get malaria?

ANSWER

Since the malaria parasites reside and reproduce in the blood, in some cases it is possible to transmit malaria from person to person through transfer of a large volume of blood, for example during a blood transfusion.

Some life stages of the parasite are also present in the liver, so cases of malaria transmission via organ donation (particularly of the liver) have also been noted. Finally, it is possible for a mother to transmit malaria to her unborn child via the placenta, or sometimes during childbirth, via the blood. The observation of malaria in newborn babies, who have not been bitten by mosquitoes, is known as congenital malaria. Despite the above possibilities, the vast majority of malaria transmission occurs via the bite of infected mosquitoes, so it is very important to protect yourself from these insects when in malarial areas.