Text 2 Malaria
What is malaria?
Malaria is caused by an infection of the red blood cells with a tiny organism or parasite called a protozoan. There are four important species of the malaria protozoa (Plasmodium falciparum, Plasmodium vivax, Plasmodium ovale and Plasmodium malariae) and each has a slightly different effect. These organisms are carried from person to person by the Anopheles mosquito. When it bites an infected person, the mosquito sucks up blood containing the parasite, which may then be passed on to the mosquito's next victim.
Symptoms of malaria
The main symptom of malaria is a fever that occurs in regular episodes, with sweating and shivers (known as rigors), and exhaustion (because of anaemia). In some cases, it can affect the brain or kidneys.
Who's at risk of malaria?
Malaria occurs where the Anopheles mosquito breeds, predominantly in rural tropical areas. From a UK perspective, it's a threat to people travelling to malarial regions in Africa, the Middle East, Asia and central America. Each year about 2,000 people return to the UK with malaria, and approximately 12 people a year die as a consequence of the disease. Malaria is a major killer in many countries where resources for prevention, proper diagnosis and drug treatments are lacking. If diagnosed promptly, it can be easily treated but the symptoms can be vague and UK doctors may not immediately be thinking about tropical infections. About 90 per cent of travellers who contract malaria do not become ill until after they return home. Only about 12 per cent of these will become seriously ill. On average, symptoms develop 10 days to four weeks after being bitten, but symptoms can appear up to a year later. The most severe form of the disease is cerebral malaria, which is fatal in up to six per cent of adults, mainly because it's not diagnosed until it's too late. Don't make the mistake of assuming you're safe from infection if you have previously lived in a malarial region - you may build up some immunity to the disease but this can be lost quickly. And if your children were born in the UK, they'll have no immunity at all. If you're going to visit, travel through, or even just stop over in a malarial country you'll be at risk, even if you have lived there before.
Preventing malaria
By far the most important step is to avoid being bitten by mosquitoes by:
• Using effective insect repellent
• Wearing long sleeves and full-length trousers
• Staying in accommodation with screen doors and closing windows
Before you travel, check whether your holiday destination is affected by malaria. Take the recommended antimalarial drugs. Generally speaking, these are taken from one week before you travel until one month after you return, but this can vary depending on the type of drug and the country you're visiting. Even when taken exactly as advised, antimalarial drugs are not 100 per cent effective, so you should still take the other preventive measures listed above. A major problem is the steady increase in malaria's resistance to drugs used in both prevention and treatment. Always talk to your doctor if you are worried - don't just stop taking antimalarials without getting medical advice. If you develop symptoms, get help quickly - and don't forget to tell the doctor you've travelled to a malarial area. Treatment is with antimalarial medication. In the past decade, considerable progress has been made in the search for a malaria vaccine, and it's hoped one will be available within the next five to 10 years.
Text 2: Questions 11-20
11. What does each refer to in line 4?
A. type of malaria
B. protozoan
C. Plasmodium falciparum
D. Plasmodium vivax
12. According to the text, which of the following statements is true?
A. All mosquitoes carry the malaria protozoa parasite.
B. Malaria is primarily transferred by mosquitoes.
C. Most mosquitoes die from infected blood.
D. Mosquitoes will only bite an infected person.
13. Which of the following is NOT a symptom of malaria?
A. a high temperature
B. extreme tiredness
C. trembling
D. regular episodes of brain damage
14. Which of the following statements is correct?
A. Annually, 2000 people returning home to the UK die of malaria.
B. Every year, 12% of people in the UK die of malaria.
C. Every year, approximately 12 people die from being bitten in the UK by a mosquito.
D. Less than 1% of people returning to the UK with malaria die from this disease.
15. What can we infer from the following statement about malaria?
“If diagnosed promptly, it can be easily treated but the symptoms can be vague and UK doctors may not immediately be thinking about tropical infections.” (lines 18 – 20)
Doctors in the UK
A. do not know about tropical infections such as malaria.
B. do not know about the symptoms of malaria.
C. may not immediately indentify this disease.
D. do not identify illness promptly.
16. According to the text, which one of the following people will have most likely developed complete immunity to malaria?
A. A person who was born in the UK.
B. A person who spends long periods of time in malarial countries.
C. A person who frequently travels from the UK to malarial regions.
D. None of the people mentioned above.
17. If a traveller spent three weeks in a malarial country, for how long would he have to take antimalarial drugs?
A. Three weeks
B. Four weeks
C. One week
D. Eight weeks
18. What is the problem with drugs used to treat and prevent malaria?
A. Mosquitoes are becoming resistant to these drugs.
B. The malaria protozoa are becoming resistant to these drugs.
C. People are steadily becoming more resistant to malaria and no longer need these drugs.
D. People stop taking these drugs without getting the proper medical advice.
19. According to the text, which one of the following statements is true about a malaria vaccine?
A. Ten years ago, scientists created a new malaria vaccine.
B. A malaria vaccine will be available in the next five to ten years.
C. A malaria vaccine may be available in the near future.
D. A malaria vaccine will be sold in the next five to ten years.
20. Who is this article probably aimed at?
A. a doctor who is studying the effects of malaria
B. a person who is from a malarial country
C. a person who is going to visit a malarial country
D. a person who would like to eradicate malaria