premise: Pakistani Health Ministry Monday said mosquito-borne dengue fever so far has caused 41 deaths across the country since early October and the patients declared positive for dengue virus reached 1,576.
  As many as 4,397 patients with symptoms similar to dengue fever have been admitted to hospitals across Pakistan till Monday evening, said the health ministry, quoted by the state-run Associated Press of Pakistan (APP).
  Among the 41 deaths, 39 are from south province Sindh and two others from North West Frontier Province, said the APP.
  A total of 664 patients with suspected dengue fever symptoms have so far been admitted to hospitals in federal capital Islamabad and the garrison city Rawlapindi, where positive cases of dengue virus stands at 247, it added.
  Dengue fever is an acute, infectious tropical disease caused by an arbovirus transmitted by mosquitoes, and characterized by high fever, rash, headache, and severe muscle and joint pain, according to experts of the disease.
   What could be expected after patients with similar symptoms have been admitted?
hypothesis: patients declared positive for dengue virus