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.
Types of vaccines. The way in which the body responds to a vaccine depends on the type of vaccine being administered. There are several different types of vaccine available and with new technology there will be further additions.here are two basic types of vaccines: live attenuated and inactivated. The characteristics of live and inactivated vaccines are different, and these characteristics determine how the vaccine is used. Live attenuated vaccines are produced by modifying a disease-producing (âwildâ) virus or bacteria in a laboratory.