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Measles concerns are rapidly spreading across the United States, health officials say.With at least 465 reported cases in 19 states, according to the Centers for Disease Control and Prevention, it's become a serious health issue.In some areas, public officials are taking a tough stance: New York City Mayor Bill DeBlasio on Tuesday issued a health emergency, mandating that everyone living within four ZIP codes be vaccinated.In Washington state, lawmakers are working on a bill to ban personal exemptions to the measles, mumps and rubella vaccine.This is the second highest number of reported cases since measles was declared eradicated in 2000.The current number of cases is inching closer to the 2014 high, when 667 cases were reported.In Baltimore, visitors under 14 years old are not permitted inside hospitals within the LifeBridge Health system, Hearst TV's WBAL-TV reports.The temporary policy change is a precaution due to the number of confirmed case of measles in the Baltimore area.Officials with the San Francisco Department of Public Health this week released a list of places visited by a person with measles, the San Francisco Chronicle reported.While there is not a measles outbreak in the city, the Chronicle reported that city officials issued the warning as a precaution for people without immunity, as they could develop the virus if they were exposed to this individual.Measles starts with a fever, runny nose, cough, red eyes and sore throat, the CDC website says. Those symptoms are followed by a rash that spreads across the body.Measles is highly contagious and spreads through coughing and sneezing, the CDC says.