...has been linked to a spike ...是什麼意思?

The World Health Organization warns that the Zika virus is ``spreading explosively'' in the Americas, which could see up to 4 million cases over the next year. The international organization has announced a special meeting next week to decide if they should declare an international health emergency. The... 顯示更多 The World Health Organization warns that the Zika virus is ``spreading
explosively'' in the Americas, which could see up to 4 million cases over the
next year.

The international organization has announced a special meeting next week to
decide if they should declare an international health emergency.

The mosquito-borne virus has been linked to a spike in a rare birth defect in
Brazil, causing babies to be born with unusually small heads.

According to the US Centers for Disease Control, the Zika virus is now in
more than 20 countries, transmitted by the same mosquito that spreads other
tropical illnesses such as dengue and yellow fever.

請問英文達人,上面英語新聞的第三段裡的...has been linked to a spike ...該如何翻譯, 尤其這個spike在這裡是什麼意思?
麻煩了,謝謝!
3 個解答 3