Vitamin A and zinc deficiency is considered endemic in Brazil,and both of these nutritional deficiencies are known to depress immune function.
More importantly, vitamin A deficiency has been linked to an increased risk of microcephaly specifically,and zinc is known to play an important role in the structure and function of the brain.
Even the U.S. Centers for Disease Control and Prevention (CDC) lists malnutrition and exposure to toxic chemicals as two of the three known risk factors. The third is certain infections during pregnancy, including rubella, cytomegalovirus, toxoplasmosis, and others.
Till we meet again, be safe.
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