Porches cost a median of $67 per square foot, but vary from $20 to $85. These high end prices include all sorts of special lighting, and other perks. The materials for decking are about $5 per square foot, and average installation plus materials is about $20.he average custom home building costs for custom homes built in the United States is right around $83 per square foot. The median price however was $78 per square foot.
Two main types of HIV vaccines are currently being tested -- preventive and therapeutic. Preventive HIV vaccines: 1  Are tested in people who are HIV-negative. 2  Train the immune system to recognize and fight off HIV before it can establish infection and make the person sick.
Hepatitis A vaccine is a vaccine against the hepatitis A virus. The first successful vaccine against it was invented by Maurice Hilleman at Merck. The vaccine protects against the virus in more than 95% of cases and provides protection from the virus for at least fifteen years. There are two types of vaccines: one type contains inactivated hepatitis A virus, the other contains a live but attenuated virus.