(CNN) Five pregnant women have been hospitalized and two experienced fetal losses from measles complications in New Zealand, as an outbreak sweeps the country.

The mothers, both in the northern city of Auckland, had caught measles, and complications led to the two fetal deaths, according to the Auckland Regional Public Health Service (ARPHS). They were both in their second trimester.

These aren't counted as direct measles deaths, but rather "serious complications potentially related to maternal measles," according to the ARPHS. Three other pregnant women with measles have also been hospitalized.

Measles are easily preventable -- if you are vaccinated with one dose, it is 93% effective at preventing the disease. If you are vaccinated with two doses, as per most health authorities' guidelines, it becomes 97% effective.

Pregnant women aren't more likely to catch measles than anyone else -- but if they aren't vaccinated, they are at greater risk of miscarriage, premature labor, and having infants with low birth weights, according to the ARPHS.