Select all that apply Identify the reasons why the sense of urgency about Zika had faded in the United States by 2019. Multiple select question.

a. The particular mosquito that transmits Zika did not thrive well north of the Gulf of Mexico.
b. Children who got infected after birth generally had severe symptoms and were identified easily.
c. By 2017, the World Health Organization (WHO) announced that Zika was a "Public Health Emergency of International Concern."
d. For unknown reasons, the number of new Zika cases plunged dramatically in both the Americas and in the United States in 2017.