Zika’s first mosquito-borne transmission in the United States has not sparked alarm for the vast majority of Americans, who do not fear infection by the disease, according to a new Washington Post-ABC News poll.

Sixty-five percent of Americans say they are ‘‘not too’’ or ‘‘not at all’’ worried about being infected with Zika or an immediate family member becoming infected, which is hardly changed from 67 percent in June. Just over one-third of the public, 35 percent, is at least somewhat worried, though only 12 percent say they are ‘‘very worried’’ about infection.

The poll finds continued confidence in the federal government’s ability to respond effectively to an outbreak of Zika, also unchanged in the past two months.

Worries about Zika infections continue to fall below the highest levels of public concern about the Ebola virus in 2014 and the swine flu in 2009. In the latter case, a high of 52 percent said they worried about themselves or a family member being infected.

The lack of concern over Zika comes shortly after the first local transmission of the disease in late July, after which the Centers for Disease Control and Prevention issued a travel advisory for the Miami neighborhood where the infection occurred.

Washington Post