When Gov. Kathy Hochul signed Executive Order 65 on Oct. 5, she declared a State Disaster Emergency for all of New York and set it to run through Nov. 4. The order lets paramedics, advanced EMS providers, midwives and pharmacists give the measles, mumps and rubella vaccine. It allows registered nurses to order measles tests and requires every MMR dose to reach the state immunization registry within 72 hours. Across its ten suspended or modified provisions, the word school never appears.

The power that decides whether a child sits in a classroom during an outbreak lives in an older Health Department regulation. Under 10 NYCRR 66-1.10, a vaccine-preventable outbreak in a school allows the state health commissioner or a designee to order school officials to exclude two groups of students. Inside New York City, that power belongs to the city health commissioner. The two groups are children holding a medical exemption and children still in the process of receiving their required doses, and the exclusion continues until officials decide the danger of transmission has passed.

The emergency, in other words, changes who can vaccinate a child and how fast that shot is recorded. The rule about who stays home was already on the books, and it still turns on an outbreak inside a particular school. As of Oct. 13, TheStandardNY found no public record of a state or county order this fall directing a New York school to exclude students under it.

The case count behind the declaration has kept climbing. The governor's office reported 108 confirmed cases statewide as of Oct. 3, seven in New York City and 101 elsewhere. Of those, 92 were reported after July 15 among under-immunized rural communities in 18 counties, where local health departments have given more than 1,000 MMR doses. By the evening of Oct. 6, state Health Commissioner Dr. James McDonald put the total at 124, more than double last year's count, according to the Observer-Dispatch.

Neither the order nor the governor's release names the 18 counties. The Health Department's measles dashboard shows them in a regional chart rather than a list, so the map has to be pieced together from county announcements and weekly totals. An Aug. 21 state health advisory listed confirmed cases in Allegany, Chenango, Madison, Otsego, Seneca, Steuben and Tioga counties, along with wild-type virus in wastewater sampled in Montgomery and Yates. The dashboard update posted Tuesday put Seneca County at 22 cases and Otsego at 21, WKTV reported, while Steuben stood at 14 as of Oct. 3.

Ontario County confirmed four cases in unvaccinated residents on the day of the declaration. Lewis County announced the North Country's first case on Sept. 26, and Oneida County now has two cases in one unvaccinated household, its first in 30 years.

The order also looks south. Pennsylvania had 977 cases and five deaths as of Oct. 2, according to the executive order, which places that outbreak in rural counties along the New York line. On Oct. 9, Oxford Area High School in Chester County closed after a confirmed case. The district told students and staff who were unvaccinated or could not prove vaccination to stay home for 21 days, The Philadelphia Inquirer reported.

The last time New York used exclusion at scale, the list of children it reached was far longer. In late 2018, Rockland and neighboring Orange County kept unvaccinated students out of school for 21 days after a measles exposure, as the Centers for Disease Control and Prevention documented afterward. That December, New York City's health department told yeshivas in nine Brooklyn ZIP codes that students without the required MMR doses could not attend, whether or not measles had reached their building. Its letter to principals said the rule held even for children with an approved religious or medical exemption.

In June 2019, Albany repealed the religious exemption to the school vaccine law, and a medical exemption became the only path around it. Three Amish schools in central New York kept enrolling unvaccinated children, drew state fines and sued. This year, a federal appeals court upheld the law a second time after the Supreme Court sent the case back.

That repeal shrank the exclusion list in nearly every school building in the state. The regulation now reaches medically exempt students and students catching up on their shots. It also requires each school to keep a list of susceptible students and to update it whenever a new child enrolls or a record changes. The catch-up group is set by the 14-day rule, which requires an unvaccinated or overdue student to receive at least the first dose of every required vaccine within 14 days of starting school.

The Health Department has also changed what counts as on schedule for families near the outbreak. Its August advisory told providers that children 1 and older in any community with a case should receive two doses as early as possible, 28 days apart. The same guidance covers places with credible reports that measles is circulating, and it gives infants 6 to 11 months an early dose that does not count toward the routine series. Two doses given after the first birthday and at least 28 days apart satisfy the school requirement, so a younger child who gets the second shot early loses nothing on the school record.

If a classmate does turn up with measles, the timeline runs in days. The state advises exposed people to quarantine for 21 days and infected people to isolate until four days after the rash appears. An MMR dose given within 72 hours of exposure can prevent the illness, and the advisory says this kind of post-exposure protection has worked in settings such as schools. Seneca County Public Health Director Scott King called measles "one of the most contagious illnesses that we deal with in public health" in August, when his county had a handful of cases.

Most of what parents can do this week is paperwork, and nearly all of it can happen before anyone is sick. Ask the school nurse whether the MMR record on file shows two doses. Then ask whether your child appears on the building's list of susceptible students, since the regulation requires that list to exist and the question therefore has an answer.

Families on that list because of a medical exemption should plan for an absence of three weeks or longer if a case reaches the school. An exclusion order runs until health officials say transmission has stopped, not to a date on the calendar, and the state advises a fresh 21-day quarantine after each new exposure.

Families still completing a series can ask their pediatrician whether the accelerated outbreak schedule applies where they live. Under the emergency order, pharmacists may give MMR to children 2 and older through a standing order, a power that lasts through Nov. 4 unless the governor extends the declaration.

Adults in the building count too. The state considers most people born before 1957 immune. It advises anyone vaccinated between 1963 and 1967, when a less effective vaccine was in use, to talk with a provider about another dose, a group that includes some teachers, bus drivers and grandparents on afternoon pickup.

Hochul framed the order around access, saying in her announcement that "no one should get seriously ill or die from a vaccine-preventable disease." The dashboard updates every Tuesday with cases through the prior Saturday, and the order expires Nov. 4. Whether any county reaches for 66-1.10 before then depends on a case inside a school. The lists that would decide who goes home first are already sitting in nurses' offices in Seneca, Otsego and Steuben counties.