As the world has now well surpassed 14 million total known cases of Covid-19 and the U.S. has seen more than 3.7 million diagnoses -- some researchers are giving caution that a vaccine might not arrive as quickly and smoothly as first believed.  

Many are pinning hopes on a vaccine that could take advantage of the so-called "spikes" found on the surfaces of coronaviruses -- called "S proteins" -- that give them their pointy, or crown-like appearance. While the novel coronavirus discovered first in China last year is responsible for causing the disease Covid-19 -- other coronaviruses have been known to cause diseases such as SARS and MERS as well some types of common respiratory illnesses. The current belief is that by targeting the 'S proteins,' vaccine makers could create a shot that prevents the virus from latching onto human cells, halting the coronavirus' ability to reproduce.

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