QUESTION
How come only the female mosquitoes can pass malaria?
ANSWER
Malaria is transmitted among humans by female mosquitoes of the genus Anopheles. Female mosquitoes need to bite people to get blood, in order to carry out egg production. These blood meals are the link between the human and the mosquito hosts in the parasite life cycle. Only female mosquitoes feed on blood, thus males do not transmit the disease.
QUESTION
What measures can local people take to limit malaria infection?
ANSWER
People living in malarial areas can do a lot to protect themselves from getting malaria. There are community programs for vector control (to control or eliminate mosquitoes) that include draining swamps to remove mosquito breeding habitat, spraying with insecticide, and using biological control techniques. In addition, to prevent people from getting mosquito bites, communities can educate families to screen their windows (if possible), to sleep under long lasting insecticide treated bednets, to cover their arms and legs with clothing and to avoid being outdoors during dawn and dusk when mosquitoes are biting. Communities can also educate people to identify signs and symptoms of malaria and to seek early treatment to avoid serious disease and possibly death. See Malaria Prevention and Control for more information.
QUESTION
I was recently diagnosed with Malaria still waiting to find out what strand, but either got it in Uganda or Rwanda. I have recently came back to the states and have been bit by mosquito. I have already started to take some medication for it, but I am concerned about spreading the virus to others in the states including my family. Is it possible that if I still have the infection to spread it to others or in the states? If so what should I do.
ANSWER
There actually used to be malaria in the United States, particularly in the southern areas, but concerted mosquito control efforts as well as public health initiatives eradicated it in the 1950s. I don’t think you need to worry too much about transmitting malaria—once you are on treatment, the number of parasites in your blood drops dramatically and it becomes more difficult to transmit the parasite to a mosquito. Also, there are lots of types of mosquitoes in the US, and only those of the genus Anopheles can transmit malaria. As such, if you are concerned about spreading malaria, you should take precautions to protect yourself from mosquitoes especially at night and at dusk and dawn, as this is when Anopheles mosquitoes are most active. The type of mosquitoes which bite during the day usually belong to the genus Aedes, and cannot transmit malaria. During these high risk times of day, you should take care to wear long-sleeved clothing, and also wear insect repellent, preferably containing DEET.
QUESTION
What is a malaria host range?
ANSWER
Usually, a malaria host range refers to the natural geographical range of one of the hosts of a particular species of malaria. So, for example, Plasmodium reichenowi normally only infects chimpanzees. Chimpanzees live mainly in central and western Africa, so this would determine the host range for P. reichenowi. Other species of malaria, such as those that infect humans, have much larger host ranges, since humans live practically everywhere on the planet. In these cases, it is more likely that the range of that species of malaria is limited by climatic variables (malaria parasites require certain temperature ranges in which they are able to develop and mature) or the distribution of a suitable vector mosquito species, which also have climatic constraints.
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.
QUESTION
I was bitten by mosquitoes many years ago and I was wondering can the symptoms lie dormant for as long as 40 years? The reason I am asking is that every summer I am ill with several of these symptoms. I do not have a good immune system.
ANSWER
There are a couple of types of malaria, namely Plasmodium vivax and Plasmodium ovale, which can lie dormant for many years, and often cause relapses at regular intervals.
Next time you suffer from these symptoms, you should go to your doctor and have a blood test to check for malaria; while you are experiencing symptoms, if you have malaria, the parasites will be visible in your blood.
Once positively diagnosed, your doctor can provide you with treatment. If you do have malaria, you will need one medication to clear the infection from your blood (which kind depends on where you were when you got those mosquito bites; malaria has become resistant to certain types of medication in some areas), plus another type of medication to kill the dormant forms which are responsible for the yearly relapses. This latter medication is called primaquine, and is not recommended for people with G6DP deficiency, so you should be tested for this prior to taking the medication.
Having said all of that, it is very important to get the blood test if you suspect you have malaria, because the symptoms of malaria are very general (fever, chills, nausea, aches) and can be mistaken for many other illnesses. If your blood test is negative for malaria, then you should talk to your doctor about other possible infections.
QUESTION
Who was the discoverer of malaria?
ANSWER
Malaria has been known to humans since ancient times, though what exactly caused it and how it was transmitted was not known. The parasite which causes malaria, from the genus Plasmodium, was first observed in the blood of a patient who had died from the disease by Charles Louis Alphonse Laveran, a French physician working in Algeria. This was in 1880; a few years later, in 1897-1898, a British army doctor called Ronald Ross showed that malaria could be transmitted via the bite of a mosquito. Both doctors eventually received the Nobel Prize for their discoveries.
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).
QUESTION
what is malaria?
ANSWER
Malaria is a serious and sometimes fatal disease caused by a parasite, of the genus Plasmodium, that infects a certain type of mosquito (of the genus Anopheles) which feeds on humans. People who get malaria are typically very sick with high fevers, shaking chills, and flu-like illness. Four kinds of malaria parasites can infect humans: Plasmodium falciparum, P. vivax, P. ovale, P. knowlesi and P. malariae. Infection with P. falciparum, if not promptly treated, may lead to death. Although malaria can be a deadly disease, illness and death from malaria can usually be prevented.
QUESTION
What is the life cycle of malaria?
ANSWER
The life cycle of malaria is complex, involving a definitive host, or vector, which for human malaria is a mosquito of the genus Anopheles, and also a human host. Inside both, the malaria parasite undergoes several different transformations and reproductive cycles, which are detailed in the schematic below.
You may also view a video of malaria life cycle.
Schematic of malaria life cycle, courtesy of CDC (www.cdc.gov)