for prevention of malaria to the most rural areas of Rwanda, such as mosquito nets and medication. In recent years Rwanda has seen improvement on a number of key health indicators. Between 2005 and 2013, life expectancy increased from 55.2 to 64.0, under-5 mortality decreased from 106.4 to 52.0 per 1,000 live births, and incidence of tuberculosis has dropped from 101 to 69 per 100,000 people. The country's progress in healthcare has been cited by the international media and charities. The Atlantic devoted an article to "Rwanda's Historic Health Recovery". Partners In Health described the health gains "among the most dramatic the world has seen in the last 50 years". Despite these improvements, however, the country's health profile remains dominated by communicable diseases, and the United States Agency for International Development has described "significant health challenges", including the rate of maternal mortality, which it describes as "unacceptably high", as well as the ongoing HIV/AIDS epidemic. According to the American Centers for Disease Control and Prevention, travellers to Rwanda are highly recommended to take preventive malaria medication as well as make sure they are up to date with vaccines such as yellow fever. Rwanda also has a shortage of medical professionals, with only 0.84 physicians, nurses, and midwives per 1,000 residents. The United Nations Development Programme (UNDP) is monitoring the country's health progress towards Millennium Development Goals 4–6, which relate to healthcare. A mid-2015 UNDP report noted that the country was not on target to meet goal 4 on infant mortality, despite it having "fallen dramatically"; the country is "making good progress" towards goal 5, which is to reduce by three quarters the maternal mortality ratio, while goal 6 is not yet met as HIV prevalence has not started falling. Religion The largest faith in Rwanda is Protestantism, but there have been significant changes in the nation's religious demographics since the genocide, with many conversions to evangelical Christianity, and, to a lesser degree, Islam. According to the 2012 census, Roman Catholic Christians represented 43.7% of the population, Protestants (excluding Seventh-day Adventists) 37.7%, Seventh-day Adventists 11.8%, and Muslims 2.0%; 0.2% claimed no religious beliefs and 1.3% did not state a religion. Traditional religion, despite officially being followed by only 0.1% of the population, retains an influence. Many Rwandans view the Christian God as synonymous with the traditional Rwandan God Imana. Languages The country's principal and national language is Kinyarwanda, which is virtually