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FAQ – MALARIA
QUESTION AND ANSWER
What is malaria?
Malaria is a serious and sometimes fatal disease caused by a parasite. Patients with malaria typically are 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,
Infection with any of the malaria species can make a person feel very ill; infection with
, if not promptly treated, may be fatal. Although malaria can be a fatal disease, illness and death from malaria are largely preventable.
Is malaria a common disease?
Yes. The World Health Organization estimates that each year 300-500 million cases of malaria occur and more than 1 million people die of malaria. About 1,300 cases of malaria are diagnosed in the United States each year. The vast majority of cases in the United States are in travellers and immigrants returning from malaria-risk areas, many from sub-Saharan Africa and the Indian subcontinent.
Is malaria a serious disease?
Yes. Malaria is a
leading cause of death and disease
worldwide, especially in developing countries. Most deaths occur in young children. For example, in Africa, a child dies from malaria every 30 seconds. Because malaria causes so much illness and death, the disease is a great drain on many national economies. Since many countries with malaria are already among the poorer nations, the disease maintains a vicious cycle of disease and poverty.
Wasn’t malaria eradicated years ago?
No, not in all parts of the world. Malaria has been eradicated from many developed countries with temperate climates. However, the disease remains a major health problem in many developing countries, in tropical and subtropical parts of the world.
was started in the 1950s, but it failed globally because of problems including the resistance of mosquitoes to insecticides used to kill them, the resistance of malaria parasites to drugs used to treat them, and administrative issues. In addition, the eradication campaign never involved most of Africa, where malaria is the most common.
Where does malaria occur?
Malaria typically is found in
of the world -- in tropical and subtropical countries. Higher temperatures allow the
mosquito to thrive. Malaria parasites, which grow and develop inside the mosquito, need warmth to complete their growth before they are mature enough to be transmitted to humans.
Malaria occurs in over 100 countries and territories. More than 40% of the world’s population is at risk. Large areas of Central and South America, Hispaniola (the Caribbean island that is divided between Haiti and the Dominican Republic), Africa, the Indian subcontinent, Southeast Asia, the Middle East, and Oceania are considered malaria-risk areas.
Yet malaria does not occur in all warm climates. For example, economic development and public health efforts have eliminated malaria from the southern United States, southern Europe, Taiwan, Singapore, and all of the Caribbean islands (except Hispaniola). Some Pacific islands have no malaria because
mosquitoes are not found there.
How People Get Malaria (Transmission)
How is malaria transmitted?
Usually, people get malaria by being bitten by an infected female
mosquitoes can transmit malaria and they must have been infected through a previous blood meal taken on an infected person.
When a mosquito bites, a small amount of blood is taken which contains the microscopic malaria parasites. The parasite grows and matures in the mosquito’s gut for a week or more, then travels to the mosquito’s salivary glands. When the mosquito next takes a blood meal, these parasites mix with the saliva and are injected into the bite.
Once in the blood, the parasites travel to the liver and enter liver cells to grow and multiply. During this "incubation period", the infected person has no symptoms. After as few as 8 days or as long as several months, the parasites leave the liver cells and enter red blood cells. Once in the cells, they continue to grow and multiply. After they mature, the infected red blood cells rupture, freeing the parasites to attack and enter other red blood cells. Toxins released when the red cells burst are what cause the typical fever, chills, and flu-like malaria symptoms.
If a mosquito bites this infected person and ingests certain types of malaria parasites ("gametocytes"), the
cycle of transmission
Because the malaria parasite is found in red blood cells, 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 fetus before or during delivery ("congenital" malaria).
Malaria is not transmitted from person to person like a cold or the flu. You cannot get malaria from casual contact with malaria-infected people.
Who is at risk
Who is at risk for malaria?
Anyone can get malaria. Most cases occur in residents of countries with malaria transmission and travellers to those countries
In non-endemic countries, cases can occur in non-travellers as congenital malaria, introduced malaria, or transfusion malaria (see above).
Who are the people most at risk of severe and fatal malaria?
causes severe and life-threatening malaria; this parasite is very common in many countries in Africa south of the Sahara. People who are heavily exposed to the bites of mosquitoes infected with
are most at risk of dying from malaria. People who have little or no immunity to malaria, such as young children and pregnant women; or travelers coming from areas with no malaria, are more likely to become severely ill and die. Poor people living in rural areas who lack knowledge, money, or access to health care are more vulnerable to the disease. As a result of all these factors, an estimated 90% of deaths due to malaria occur in Africa south of the Sahara; most of these deaths occur in children under 5 years of age.
How can malaria be prevented?
If I live in an area where malaria is a problem, how can I prevent myself and my family from getting sick?
You and your family can prevent malaria by
keeping mosquitoes from biting you, especially at night
taking antimalarial drugs to kill the parasites
eliminating places around your home where mosquitoes breed
spraying insecticides on your home’s walls to kill adult mosquitoes that come inside
sleeping under bed nets - especially effective if they have been treated with insecticide, and
wearing insect repellent and long-sleeved clothing if out of doors at night
Isn't there a malaria vaccine? And if not, why?
There is currently no malaria vaccine approved for human use. The malaria parasite is a complex organism with a complicated life cycle. Its antigens are constantly changing and developing a vaccine against these varying antigens is very difficult. In addition, scientists do not yet totally understand the complex immune responses that protect humans against malaria. However, many scientists all over the world are working on developing an effective vaccine. Because other methods of fighting malaria, including drugs, insecticides, and bed nets, have not succeeded in eliminating the disease, the search for a vaccine is considered to be one of the most important research projects in public health.
I am 4 months pregnant but want to visit a malaria-risk area for 2 weeks. Is it safe to do so?
NVBDCP advises women who are pregnant or likely to become pregnant to avoid travel to areas with malaria risk, if possible. Malaria in pregnant women can be more severe than in nonpregnant women. Malaria can increase the risk for adverse pregnancy outcomes, including prematurity, miscarriage, and stillbirth. No preventive drugs are completely effective. Please consider these risks (and other health risks as well) and discuss with your health-care provider.
Which are the malaria high-risk areas in our country?
No area in the country can be said safe for malaria except place at altitude above 2000-2500 meters (due to unfavorable climatic conditions). The states of Orissa, West Bengal, Jharkhand, Rajasthan, Madhya Pradesh, Chhattishgarh, Andhra Pradesh, Maharastra, Gujarat & North Eastern states (except Sikkim) are high risk States for malaria.
Symptoms and Diagnosis
What are the signs and symptoms of malaria?
Symptoms of malaria include fever and flu-like illness, including shaking chills, headache, muscle aches, and tiredness. Nausea, vomiting, and diarrhea may also occur. Malaria may cause anemia and jaundice (yellow coloring of the skin and eyes) because of the loss of red blood cells. Infection with one type of malaria
, Plasmodium falciparum,
if not promptly treated, may cause kidney failure, seizures, mental confusion, coma, and death.
How soon will a person feel sick after being bitten by an infected mosquito?
For most people, symptoms begin 10 days to 4 weeks after infection, although a person may feel ill as early as 7 days or as late as 1 year later. Two kinds of malaria,
can relapse. In
infections, some parasites can remain dormant in the liver for several months up to about 4 years after a person is bitten by an infected mosquito. When these parasites come out of hibernation and begin invading red blood cells (“relapse”), the person will become sick.
How do I know if I have malaria?
Most people, at the beginning of the disease, have fever, sweats, chills, headaches, malaise, muscles aches, nausea and vomiting. Malaria can very rapidly become a severe and life-threatening disease. The surest way for you and your health-care provider to know whether you have malaria is to have a diagnostic test where a drop of your blood is examined under the microscope for the presence of malaria parasites. If you are sick and there is any suspicion of malaria (for example, if you have recently traveled in a malaria-risk area) the test should be performed without delay.
Any traveler who becomes ill with a fever or flu-like illness while traveling and up to 1 year after returning home should immediately seek professional medical care. You should tell your health care provider that you have been traveling in a malaria-risk area.
When should malaria be treated?
The disease should be treated early in its course, before it becomes severe and poses a risk to the patient's life. Several good antimalarial drugs are available, and should be administered early on. The most important step is to think about malaria, so that the disease is diagnosed and treated in time.
What is the treatment for malaria?
Malaria can be cured with prescription drugs
The type of drugs and length of treatment depend on which kind of malaria is diagnosed, where the patient was infected, the age of the patient, whether the patient is pregnant, and how severely ill the patient is at start of treatment.
If I get malaria, will I have it for the rest of my life?
No, not necessarily. Malaria can be treated. If the right drugs are used, people who have malaria can be cured and all the malaria parasites can be eliminated. However, the disease can persist if it is left untreated or if it is treated with the wrong drug. Some drugs are ineffective because the parasite is resistant to them. Some patients may be treated with the right drug, but at the wrong dose or for too short a period of time.
Two types (species) of parasites,
, have dormant liver stages that can remain silent for years. Left untreated, these liver stages may reactivate and cause malaria attacks ("relapses") after months or years without symptoms. Patients diagnosed with
are often given a second drug to help prevent these relapses. Another type (species),
, if left untreated, has been known to persist in the blood of some persons for several decades.
But in general, if you are correctly treated for malaria, the parasites are eliminated and you are no longer infected with malaria.
How do I find out what is the best drug to take against malaria?
Many effective antimalarial drugs are available. Please contact your family physician or nearest hospital/primary health centre or health care workers.
Can children also take malaria pills?
Yes, but not all types of malaria pills. Children of any age can get malaria and any child traveling to a malaria-risk area should be on an antimalarial drug. However, some antimalarial drugs are not suitable for children. Doses are based on the child’s weight.
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