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Measles has made a shocking return to the US. Can it be stopped?

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measles vaccine sign
Rockland County, New York, is the site of a major measles outbreak
Johannes Eisele/AFP/Getty Images

MEASLES is making a comeback in the US. Public health departments are starting to take serious measures to curb the disease, but in an age of misinformation, simply telling people to get vaccinated may not be enough.

New York City is taking drastic action. On 9 April, mayor Bill de Blasio declared a state of emergency in the borough of Brooklyn, and mandated that anyone living in the four zip codes where a measles outbreak has raged since October must be vaccinated or face fines of up to $1000. The unprecedented move was a result of the staggering rise in the number of measles cases, which have mostly been confined to the Orthodox Jewish community in Williamsburg, the mayor said in a press conference.

In 2017, there were two cases of measles in New York City. In the past six months, there have been 285. “That’s got our full attention,” said de Blasio, adding that the city will offer free vaccines for those without health insurance.

These measures are required because the city is really fighting two epidemics. Measles is fast-spreading and can be deadly. So is the anti-vaccine movement, which has infected the US over the past 20 years, aided by social media platforms and organised misinformation campaigns (see “Computer virus”).

There have already been of measles in the US this year, according to the Centers for Disease Control and Prevention (CDC). If the disease continues to spread at that rate, there could be more than 1800 cases by the end of the year.

This comes as a shock, given that in 2000, the CDC declared measles to be eliminated in the US. Around the same time, the anti-vaccine movement took hold. Patient zero was a study linking the measles, mumps and rubella (MMR) vaccine and autism.

The study has since been retracted, but the damage it did continues to ripple across the US. The anti-vaccine sentiment has “grown from a fringe movement into a media empire”, says Peter Hotez at Baylor College of Medicine in Texas.

“There have been 465 cases of measles in the US so far this year. At that rate, it could hit 1800 by year end”

It has also led to a weakening of medical regulations, the effects of which are now being felt. All 50 US states require children who attend public schools and some childcare centres to be vaccinated. However, most now allow exemptions for people who have religious beliefs against immunisation. And based on personal objections to vaccines.

As a result, the CDC says that the number of unvaccinated babies and toddlers has quadrupled between 2001 and 2015, going from 0.3 per cent to 1.3 per cent.

That may sound small, but the effects could be disastrous. The spread of measles can only be prevented with herd immunity, meaning 90 to 95 per cent of people have been vaccinated. Very young children were at 91.1 per cent in 2016, according to the CDC.

Last year, he and his team . They plotted the urban areas with the highest rates of NMEs, which ranged from 400 to nearly 3000 unvaccinated children.

“It turns out we generated a pretty good measles prediction map,” says Hotez. Many of the 15 urban area hotspots his team identified have had measles outbreaks in 2019, he says.

Threatening people with fines, as New York City is doing, isn’t the only way to fight an outbreak. In 2017, measles took hold in the Somali-American religious community in Minnesota, resulting in .

“At the time of the measles outbreak, it was the holy month of Ramadan, so when I was speaking to parents, I was asking them to please stay home and not go to the mosque if they don’t want to vaccinate their child,” says Fatuma Sharif-Mohamed at the Minnesota Department of ҹ1000.

Trusted information

Sharif-Mohamed is Somali-American herself, and the department relied on her and other Somali-American staff to act as sources of information that the community could trust. “You have to make them understand in their language,” she says.

Lynn Bahta, who also works at the Minnesota Department of ҹ1000, says that appealing to people’s faith helped sway some to vaccinate their children. “They believe that if you’re sick, you stay home and don’t spread it to others. The cultural element of that faith was to the advantage in this kind of outbreak,” she says. The department made the recommendation that parents keep their children out of school and public places, but didn’t have to go so far as to mandate it.

Similar steps were taken in Ohio in 2014, during a measles outbreak centred on the Amish community. There were 383 measles cases across nine counties. Amish tradition doesn’t explicitly forbid vaccinations, although many people hadn’t been immunised. Public health officials in Ohio worked with local leaders to gain the trust of parents and ultimately .

While these approaches were successful, the anti-vaccine movement and the resulting decline in vaccination rates around the country has meant that public officials are faced with taking harsher action.

“We have received reports that there are people attending so-called measles parties, bringing people together to purposely get exposed,” said Herminia Palacio, New York City’s deputy mayor for health and human services, at the 9 April press conference. “We have seen people who have been hospitalised, people who have had to be admitted to the intensive care unit due to complications. Thank goodness we haven’t seen a death, yet.”

The emergency vaccine mandate in New York City goes even further than a controversial measure taken in nearby Rockland County a few weeks earlier. As of 8 April, there were 168 confirmed measles cases in the county, which is about 65 kilometres north of New York City and also hosts a large Orthodox Jewish community.

On 27 March, county public health officials issued a month-long ban on unvaccinated children in public places. Those in violation faced a $500 fine or up to six months in jail.

John Lyon, a spokesperson for Rockland County, says the order resulted in almost 700 new MMR vaccinations. “The final number is likely to be higher than that, because doctors have up to two weeks to update the state on those vaccinations,” he says. “We did hear anecdotally that a lot of local doctors’ offices were very busy in the days following the state of emergency declaration.”

Ten days after the ban was ordered, a , in response to a lawsuit brought by parents. The judge deemed the ban too broad and said the outbreak doesn’t constitute a disaster in which emergency powers should be used.

“Children have a right of access to vaccines to prevent serious or deadly infections”

Efforts to dismantle the anti-vaccine movement are likely to face similar hurdles. Hotez says removing NMEs, as West Virginia, California and Mississippi have done, will be a key battleground. “Children have a fundamental right of access to vaccines to prevent serious or deadly infections and we shouldn’t take that right away,” he says.

But Bahta says that may pour fuel on the fire. “Some days I think we should take away all NMEs, and other days I think having that leeway probably de-intensifies the militant nature in people who have really strong anti-vaccine sentiments,” she says.

Forcing people to comply may make them resist. Treating them as parents who are concerned for their children’s health, and letting them know you have that shared goal, may be more effective.

In the end, we will have to wait and see whether compassionate education or regulation is the better approach. It is likely to be a little bit of both.

Computer virus

Anti-vaccine messaging has spread like wildfire – with social media the tinder. As measles cases have surged in recent months, tech companies have announced policies to try to curb vaccine misinformation.

, but will aim to stop promoting it. that it will stop selling adverts on videos with false vaccine information, and .

While failing to remove false information does little to help matters, getting rid of vaccine content all together could end up being even worse.

“What Pinterest did is the wrong thing to do,” says Peter Hotez at Baylor College of Medicine in Texas. “They quashed all the pro-vaccine stuff, too. It sends a chilling message that there’s an equivalence between the anti-vaccine movement and what the medical community is saying.”

Article amended on 1 May 2019

We corrected the terminology describing the status of measles in the US

Topics: Vaccines / Viruses