History of Medicine

Pandemic probably tops the long list of new words added to our vocabulary in 2020, but before it earned that notoriety, covid-19 was classified as an epidemic in Wuhan, China. It was only in March 2020 that WHO upgraded it to a pandemic -- far deadlier and more widespread than an epidemic. What's in a name, you ask? Merriam Webster defines an epidemic as a disease affecting a large number of individuals within a population, community, or region at the same time;  a pandemic is an epidemic occurring worldwide, or over a very wide area, crossing international boundaries and usually affecting a large number of people, according to the WHO. Not surprisingly, both words are derived from ancient Greek. Pandemic comes from the Greek word pandemos , based on pan meaning "all" + demos meaning "people" or "population"; pandemic therefore affects nearly all of the people. In contrast, epi means "upon," so epidemic is something visited upon the people. 

Although we have come to associate COVID-19 with many negatives-  school closures,   quarantine, social distancing, and travel restrictions to name a few- it has also provided a boost for science, particularly in the area of vaccine research. The pandemic of historical proportions has triggered a global race to develop a vaccine against the virus. The development of a new vaccine typically takes 10-15 years, a luxury the world can ill afford right now. So companies around the world are racing to find a solution in record time. This has led to the development of an entirely new type of vaccine called mRNA or messenger RNA vaccine. mRNA vaccines are not a new concept; they have been known for a few decades but have not been developed seriously until now. mRNAs are tiny pieces of genetic code that tell cells in our bodies to make a protein.  The two companies at the forefront of vaccine development, Pfizer and Moderna, are both using mRNAs to develop a vaccine. They both use synthetic mRN