Warnings. 1  Don't become obsessed with security. 2  Even the most solid lock system is worthless if the frame around the door is weak. 3  If you're not used to locking your doors and you have a door that you can lock without a key, take care to remember your keys whenever you leave the house.
Bacteria that cause urinary tract infections invade bladder cells. Scientists at Washington University School of Medicine in St. Louis have found definitive proof that some of the bacteria that plague women with urinary tract infections (UTIs) are entrenched inside human bladder cells. The finding confirms a controversial revision of scientistsâ model of how bacteria cause UTIs. Previously, most researchers assumed that the bacteria responsible for infections get into the bladder but do not invade the individual cells that line the interior of the bladder.
The immune system is a collection of billions of cells that travel through the bloodstream. They move in and out of tissues and organs, defending the body against foreign bodies (antigens), such as bacteria, viruses and cancerous cells. There are two types of lymphocytes : B cells-produce antibodies which are released into the fluid surrounding the bodyâs cells to destroy the invading viruses and bacteria. T cells (see picture opposite) - if the invader gets inside a cell, these (T cells) lock on to the infected cell, multiply and destroy it.