[lemma=□] □
[lemma=malaria] □
Using tiny amounts of DDT in the home has proven effective at preventing malaria , but rich countries wo n't fund DDT programs because of lingering fears of the chemical . The presence of malaria , as that of most other endemic tropical diseases , is directly related to the precarious living conditions of people in developing countries , but is also a cause that hinders growth and development , " In Africa today , malaria is understood to be both a disease of poverty and a cause of poverty . While this technique is still considered the " gold standard " for diagnosing malaria , it lacks the sensitivity to detect low-level chronic infections . Malaria , cryptosporidiosis , African and American trypanosomiasis and leishmaniasis threaten human beings , both for the high mortality rates involved and the economic loss resulting from morbidity . There are four types of malaria which affects humans : Plasmodium vivax , P. malariae , P. ovale and P. falciparum . Vector-borne diseases , like malaria , dengue , West Nile , and Rift Valley Fever are major public health problems in cities throughout the world .