A new virus called the Zika virus is spreading at a very rapid pace which is even more severe than the previous Ebola virus. This Zika virus has already spreaded to over 25 countries in Central and South America and may spread all over the world through people who have travelled to the affected regions. It has already got the declaration as a global concern by the World Health Organisation due to microcephaly condition linked to Zika virus infection. Therefore early vaccine development to tackle the virus is a global emergency. But the real problem behind vaccine trials is that it has to be tested on pregnant women which are ethically questionable.

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