ADMICRO

An American pharmaceutical company has focused on designing a vaccine (i) _______ of a viral strain or variety that infects primarily humans. This vaccine has the advantage of protecting against most types of rotavirus infection, but because it is derived (ii) _______ a human strain, it can have serious side effects and even cause the disease itself. Another Europe company developed a different vaccine type by combining human strains with ones taken from cows. In this case, the vaccine is too weak to cause disease in people, however, it only offers protection against major types of rotavirus infection. Regardless of their initial structure, (iii) _______ vaccines work in similar ways by attaching themselves to the VP4 spikes and triggering an immune response before viral cells have a chance to spread (iv) _______ contaminate healthy cells. The two rotavirus vaccines are now undergoing clinical trials and are awaiting (v) _______ to be released on the market. So far, they have proven to have a 90% rale of success

without registering any major side effects.

(ii)_____

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