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Microbiology For The Health Sciences (MKK). (text book)
Bacteria are among the fastest growing and reproducing microorganisms that can be found anywhere in the world. Human
hands exchange microorganisms between the skin surface and the environment, picking up and harboring the colonization
of pathogenic species such as bacteria in large quantities along the way. Due to the Covid-19 pandemic, the demand for
hand sanitizers has sharply increased worldwide as they provide a practical, convenient, effective way to clean human
hands from unwanted microbial inhabitants. Hand sanitizers are antibacterial and antiviral liquid cleaning products made
of ethanol and other active compounds capable of sterilizing bacteria-covered surfaces such as human skin by damaging
bacterial cell membranes. This research was done by conducting a simple practicum through the utilization of household
tools and materials in formulating bacterial growth medias as well as observing and comparing bacterial colonies that
inhabited hand palms before and after the usage of hand sanitizers. The practicum was done by comparing bacterial
colonies on (1) bacterial growth media without human interference, (2) bacterial growth media touched with hand palms
before the usage of hand sanitizers, (3) bacterial growth media touched with palms after the usage of hand sanitizers. This
research aims to investigate the effects of hand sanitizers on bacteria colonizing human hands. Results show that the
bacterial growth in each of the mediums given different treatments presented different numbers of bacterial colonies.
Abundant bacteria grew on medium that was touched with a palm before applying hand sanitizer while limited bacteria
grew on medium that was touched a palm after applying hand sanitizer. According to these practicum results, it can be
concluded that the application of hand sanitizer is effective in reducing the number of bacterial colonies inhabiting hand
palms. Recommendations for future and further investigations include comparing various hand sanitizer brands to conclude
which brand produces the most effective hand sanitizers in removing bacteria from human hands.
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