This is mostly caused by tires that are overinflated. When a tire is overinflated, the tire, in essence, bulges out more in the center. The tire then rides mostly on that bulge and that bulge wears faster than the sides of the tire. Keeping your tires properly inflated can help you to avoid center wear.
Lysozyme is abundant in a number of secretions, such as tears, saliva, human milk, and mucus. It is also present in cytoplasmic granules of the macrophages and the polymorphonuclear neutrophils (PMNs). Large amounts of lysozyme can be found in egg white.
The germs eventually make their way into the tick's salivary glands and the tick spits them into you while feeding. Some infections, especially viruses, move into the tick salivary glands faster than others. Lyme disease bacteria take at least 24 hours to invade the tick's saliva.