Why do people in developed countries live longer with infectous diseases than in least developed countries?
Because most developed countries offer free medical care and have better access to good, well tested medical treatment. Less developed countries have more poor people living in them, these people can not afford to pay for treatment and they are probable not as well educated and therefor do not understand that they should use condoms to protect themselves against such diseases as HIV and Hepatitis. In conclusion, more less wealthy, poorly educated live in underdeveloped countries and they can not obtain the necessary treatment. Where people in developed countries are better educated and more wealthy, so they do have access to better treatment.