Communion Host: 2.7 million bacteria/square inch, Hands: 15,000 bacteria/square inch, Cell Phones: 25,000 bacteria/square inch, Tabletops: 21,000 bacteria/square inch. E coli Infective Dose: 10 cells, Salmonella Infective Dose: 15 cells. Recent research has revealed that antibacterial hand sanitizers are not effective in killing 99.9 of germs as claimed. Handling food with gloves gives a 5.2 percent higher rise to microbial growth than hands.