Part 1 of the experiment : washed and unwashed hand

Part 1 of the experiment : washed and unwashed hand

Colony of bacteria

Visually most of the colonies of bacteria looked identical, similar size and colour. See approximately 80% reduction in number of colonies post wash

See mixed colonies, probably different species of bacteria. Very large numbers in the unwashed side. Also note a fungi on the UW side. Remember, we have a normal commensal population of various micro-organisms on our skin surface.

Spot solution killed all bacteria in the vicinity (contains ethanol)

Vinegar, 3% acetic acid show a potent antimicrobial activity

No antimicrobial activity shown by contact lens solution to hand micro-organisms

Bacteria colonies look much smaller around the penicillin disk- affecting their numbers and size of colonies?

Similar finding to other plate

Mouth wash experiment

No colonies were visible in the with mouth wash side of the plate. Chlorhexidine is the gold standard of chemical antimicrobial agents in the mouth washes. However, adequate and effective teeth brushing is the goal.

Dramatic difference. Note mixed population of bacteria, colour and size difference between colonies.

Large reduction in the number of colonies after rinsing