One more unvaccinated child has measles, according to Clark County Public Health.

The Monday announcement brings the total count of people infected with measles up to 35 -- the majority of whom are children. Public health officials also identified eight new locations where people might have been exposed to the measles virus and included two daycare centers. The virus is passed through the air and can linger in an isolated space for up to two hours.

One person has been hospitalized during the outbreak.

The places where people might have been exposed are:

St. Paul Christian Daycare, 1309 Franklin St., Vancouver: Wednesday, Jan. 16 Thursday, Jan. 17 Friday, Jan. 18 Wednesday, Jan. 23

Yelena’s Daycare, 17007 NE 23rd St., Vancouver: Tuesday, Jan. 22 Wednesday, Jan. 23

Kaiser Orchards Medical Office, 7101 NE 137th Ave., Vancouver from 1:50 to 7:30 pm Thursday, Jan. 24.

Oregon Museum of Science and Industry, OMSI, 1945 SE Water Ave., Portland from 2:30 to 7 pm Saturday, Jan. 19.

New Life Mission Church, 3300 NE 172nd Place, Portland from 9:30 am to 2 pm Sunday, Jan. 20.

Trader Joes, 305 SE Chkalov Drive, Vancouver from 12:30 to 3:40 pm Monday, Jan. 21.

Dollar Tree, 305 SE Chkalov Drive, Vancouver from 1:10 to 4 pm Monday, Jan. 21.

Walmart Supercenter, 14505 NE Fourth Plain Blvd., Vancouver 1:30 to 5 pm Monday, Jan. 21.

The outbreak has started to extend outside the Vancouver area. One man who traveled to Clark County was diagnosed with measles. In Oregon, one case was discovered in Multnomah County. It’s not yet clear where the person lives.

Two people were quarantined during a visit to Hawaii when doctors realized they had been exposed to measles in Clark County and developed the associated rash during the trip.

Washington Gov. Jay Inslee declared a state of emergency due to the outbreak on Friday, three days after officials in Clark County declared a public health emergency.

The highly contagious virus spreads through the air and can linger for up to two hours in an isolated space. People who have never received a measles vaccine are susceptible to the disease, which can be deadly.

State public health officials are urging people who have not received the vaccine to get it now -- as well as people who received the first dose but never the second, both of which are recommended in the first 10 years of life.

The measles vaccine is 97 percent effective, and can reduce the risk of infection if gotten within 72 hours after exposure to the virus.

Clark County health officials are keeping both students and staff who cannot prove they have been vaccinated from the schools linked to the outbreak, most of which are in the Evergreen School District. Those who are excluded are also not supposed to enter other schools, child care centers or places with lots of people.

Even friends and families of students and staff at Evergreen High School and Orchards, Hearthwood and Image elementary schools are asked not to attend any events or games at the schools unless immunized. The Clark County health department has placed this restriction until Jan. 30 for most schools and Feb. 5 for Orchards.

To further limit the spread of the virus, health officials ask that people who think they might have measles call their doctor or health care provider before visiting a hospital or doctor’s office.

Washington State Department of Health keeps track of residents’ immunization status so people can see if they need shots.

Clark County Public Health also now maintains a daily call center for questions about the outbreak at 360-397-8021.