Obtained by steam distillation of the lavender flowers, lavender essential oil is effective in repelling dust mites, fleas, mosquitoes, ticks, bedbugs and spiders. Lavender does not kill insects. The aromatic scent of lavender is offensive, causing insects to flee the area.
The body's defense system. Most viruses do not cause serious diseases and are killed by the body's immune systemâits network of natural defenses. In many cases, people never even know they have been infected. But unlike bacteria, which can be killed by antibiotics, most viruses are not affected by existing medicines. Fortunately, scientists have been able to make vaccines, which help the body develop natural defenses to prevent many viral infections.
The inactivated polio, hepatitis A, influenza (shot) , and rabies vaccines are made this way. Because the virus is still seen by the body, cells of the immune system that protect against disease are generated. There are two benefits to this approach:1  The vaccine cannot cause even a mild form of the disease that it prevents. 2  The vaccine can be given to people with weakened immune systems.se part of the virus. Using this strategy, just one part of the virus is removed and used as a vaccine. The hepatitis B and the human papillomavirus (HPV) vaccines are made this way.