The name “chikungunya” derives from a word in the Kimakonde language, meaning “to become contorted”, and describes the stooped appearance of sufferers with joint pain (arthralgia). Chikungunya is a mosquito-borne viral disease transmitted to humans by infected mosquitoes. Aedes aegypti mosquito (also called yellow fever mosquito) is the primary transmission agent of Chikungunya Virus. Presence of stagnated water in and around human inhabitation is one of the main causes of increased aedes mosquito population. This in turn causes a large number of mosquito bites leading to the rapid spread of Chikungunya virus.
Chikungunya typically starts with one or more of the following symptoms - chills, fever, vomiting, nausea, head ache and joint pain. The attack is sudden and sometimes it is accompanied with rashes. Severe joint pain is the main and the most problematic symptom of Chikungunya.
In Norway compares mortality rates from the period 2002-2007 with trends prior to the introduction of the vaccine.Across all age groups, the death rate from varicella-related illnesses fell from 0.41 per million population in the early 1990s to 0.05 million population in 2007.In the last six years analyzed (2002-2008), a total of three deaths per age range were reported among children aged one to four and five to nine years. In the pre-vaccine era, annual death rates averaged at 13 and 16 deaths, respectively.