avaged by malaria, Assam is struggling to control the dis-ease. Like in most other parts of the country, the health infrastructure is in a state of terminal decay. Forget the remote villages, even the district health centres are in shambles.
Check out Lakhimpur district — a microcosm of Assam, if not the whole country. Hollow-eyed patients lie in rows on the mud floor of an unfinished rural school building. Saline drips are strung across a dark room. At the door, a small group of patients and their families wait their turn, with the two harried
doctors in charge of the peripheral malaria ‘hospital’, a makeshift unit housed in Rampur ME
School, at sea. So far, over 200 villagers have been brought to the school in the remote interior of Lakhimpur to have their blood tested and, if lucky, get the right treatment. Pathologists from the Union health and family welfare department conducting rapid blood tests said 100 per cent of those who tested positive for malaria
carried the deadly variant of the pathogen that causes the dis-ease —Plasmodium falciparum(Pf).
The doctors are despairing. “We have been sent here with only 16 ampoules of quinine. It’s horrible,” says U N Dutta, one of the two doctors at the emergency hospital. “We don’t have enough doctors or paramedic staff or medicines,” adds Dutta, who is also the joint director of health services, Lakhimpur district. Yet, some 370 km away, sitting in his air- conditioned office at Dispur, a senior health official says casu-ally, “There is no shortage of either medicine or doctors.” Emergency health camps like these, set up around the dis- trict and other malaria-affected regions across the state, rely on NGOs like Jan Kalyan, Voluntary Health Association of Assam, and Medecins Sans Frontieres (MSF) for doctors, drugs and ambulance services.
The situation isn’t much better at Lakhimpur Civil Hospital in Khelmati town. Malaria patients line hospital cor-ridors, some on metal beds, some on rags laid out on the floor. The 200-bed hospital is scrambling to deal with an influx of nearly 500 patients, most suffering from malaria. More arrive in droves everyday from surrounding villages. The official malaria death toll in Lakhimpur, which appears to be worst affected this year, was 60 as of May 16. Statewide the toll was pegged at 138. The figures are based on the number of reported deaths at the civil and peripheral hospitals.
But Dutta and Jan Kalyan workers, who have been treating patients in villages since April, say at least 300 people had succumbed to the disease in Lakhimpur. They cite late, poor quality testing as possible reasons for the low official fig-ures. According to government guidelines, only patients test-ing positive for the Pf parasite at time of death are listed as malaria victims. “Government hospitals cannot test the blood samples in time,” says Irshad Ali of Jan Kalyan, Lakhimpur. “Hundreds of samples are still lying at the hospitals. By the time they are tested, who knows how many patients will have died of Pf .”
Besides, says Dutta, “once Pf enters vital organs like the liver and brain, it can’t be found in the blood anymore. Blood smear tests conducted at this stage won’t show he parasite.” And of course, there are people in remote areas who don’t even make it within sniffing distance of a medical facility. Unhealthy system Malaria has been endemic to Assam and other northeastern states for long. Excessive rainfall and humidity in the region spawns large mosquito populations. Official estimates say the
disease claims about 500 lives annually. In Assam, the official toll last year was 230. Independent estimates, however, say the figure probably runs into a few housands.
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While it is true that new drugs have succeeded in checking the spread of malaria, pharmaceutical research is struggling to come up with newer drugs because Pf keeps developing drug resistance. The history of the pathogen worldwide shows how difficult the war against malaria can be.
For instance, Pf was first seen to have developed resistance to chloroquine, for long the first-line drug against malaria, almost simultaneously in Colombia and the border between Thailand and Cambodia. In Asia, chloroquine resistance was initially confined to the Indochinese peninsula until the 1970s, when it spread westwards and towards the neighbouring islands in the south and east. The advent of chloroquine resistance in Africa occurred much later, taking a decade to cross the continent. Today, only countries in Central America, north of the Panama Canal, and the island of Hispaniola have not documented chloroquine-resistant Pf malaria.
In India, the first case of chloroquine-resistant Pf was identified in Karbi Anglong in 1973 (see table: Pockets of resistance). Official reports of the nvbdcp directorate, under the directorate general of health services, show that Pf has now developed resistance against chloroquine in 237 primary health centres (phcs) in 52 districts in 19 states. There have been reports that 12 phcs in seven states get cases of malaria resistant to sp, the recommended second-line drug.
Pf has developed resistance to almost all drugs available to counter it. For instance sp which was used as a replacement for chloroquine in most countries, became ineffective in Thailand and its neighbouring countries by the beginning of the 1980s. Resistance to this drug has spread to South America. It has also spread to the African continent. In 1993, Malawi was the first country in East Africa to change from chloroquine to sp as the first-line drug, and other African countries followed this example in the late 1990s. But extensive use of this drug rendered it ineffective.
Similarly, Pf has become resistant to mefloquine, another drug used to treat this parasite. Sporadic cases of prophylactic failure of mefloquine in travellers and therapeutic failure have been reported in Africa, Asian countries and South America. The pathogen has also developed resistance against amodiaquine and quinine.
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The pathogen becomes drug resistant through spontaneous mutations. Sometimes mutations destroy the pathogen. If that does not happen, the parasite usually develops resistance to the environment it is in -- meaning the drug that is being administered.
As most of the anti-malarial drugs being used are closely related chemically, development of resistance to one facilitates development of resistance to others. For example, chloroquine and amodiaquine are related, so are mefloquine, halofantrine and quinine. Experts also suggest that development of resistance to a number of anti-malarial drugs makes the falciparum parasite genetically plastic and allows it to adapt to a new drug, even when it is not chemically related to drugs previously experienced. The long half-life of drugs like sp and mefloquine also increase the likelihood of resistance developing as these stay in the body for long periods.
Reliance on presumptive treatment also facilitates the development of anti-malarial drug resistance. Once a certain drug environment expands, the pathogen that has mutated to survive that environment is naturally selected and its population keeps growing, making it necessary to create new drugs to create different, hostile environments.
Inferior drugs, which do not have sufficient quantities of active ingredients, also help in promoting resistance.
The way out, most experts agree, is using a combination of drugs, which makes developing resistance difficult. A P Dash, director, nimr, Delhi, says combination therapy should be used in the country. Falciparum malaria has developed resistance to chloroquine due to a mutation in the Pfcrt gene, which is responsible for the parasite's membrane functions.
The mutation is rampant in the country, making combination therapy essential. Bhawna Sharma of Drugs for Neglected Diseases initiative, a subsidiary of msf, and V P Sharma, former director of nimr, also stress the importance of combination therapy.
Unfortunately, as we will see, the drug regimes followed in this country have been utterly misconceived.
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While there are such sporadic initiatives, the government has made no real attempt to shift to a more rational drug regime, despite promptings from who.
who has been suggesting for a long time that all countries where Pf has shown more than 10 per cent resistance to chloroquine, amodiaquine or sp, should use combination therapies, preferably containing artemisinin derivatives. These are known as artemisinin combination therapies (acts).
act has to be administered for two to three days compared to seven days of artemisinin as monotherapy. And since the pathogen is removed quickly, the chances of it developing resistance are further reduced.
On the northwestern border of Thailand, there was a 47 per cent reduction in the incidence of Pf infections in the 12 months after acts containing artesunate and mefloquine were introduced, without vector control programmes. Over the next 10 years, there was a six-fold reduction in malaria transmission. Similarly in Vietnam, use of acts has led to a substantial drop in malaria incidence. And in KwaZulu Natal, South Africa, a reduction in malaria cases, and fatalities, of more than 90 per cent has been sustained over the past three years after vector control programmes were introduced along with acts.
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