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.
Vaccines have contributed to a significant reduction in many childhood infectious diseases, such as diphtheria, measles, and Haemophilus influenzae type b (Hib). Some infectious diseases, such as polio and smallpox, have been eliminated in the United States due to effective vaccines.accines work by preparing the bodyâs immune system for future attacks by a certain disease, caused by either viruses or bacteria. Vaccines contain weakened bacteria or viruses, or parts of bacteria or viruses, and mimic these disease-causing agents (which are called antigens).