An unvaccinated six-year-old Oregon boy was hospitalized for two months for tetanus and almost died of the bacterial illness after getting a deep laceration on his forehead while playing on a farm, according to a case study published by the US Centers for Disease Control and Prevention (CDC).

The 2017 case is the first case of pediatric tetanus in Oregon in more than 30 years and alarmed infectious disease experts, who said tetanus is almost unheard of in the US since widespread immunization began in the 1940s.

The child received an emergency dose of the tetanus vaccine in the hospital but his parents declined to give him a second dose – or any other childhood shots – after he recovered, the paper said.

“When I read that, my jaw dropped,” said Dr William Schaffner, an expert in infectious diseases and chair at the department of preventive medicine at the Vanderbilt University School of Medicine in Nashville, Tennessee. “I could not believe it. That’s a tragedy and a misunderstanding and I’m just flabbergasted.

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“This is an awful disease, but … we have had a mechanism to completely prevent it and the reason that we have virtually no cases any more in the United States is because we vaccinate, literally, everyone.”

The CDC paper did not provide any details about the child, his family or where they live in Oregon and attempts to get that information from the paper’s authors were unsuccessful.

Lawmakers in Oregon and Washington are considering bills that would end non-medical exemptions for routine childhood vaccines as the Pacific north-west weathers its third month of a measles outbreak. Seventy people in south-west Washington, most unvaccinated children, have been diagnosed with the highly contagious viral illness since 1 January, as well as a handful of people in Portland, Oregon.

Unlike measles, which is a virus, someone who has survived a case of tetanus is not immune and can get the illness again if they remain unvaccinated. Tetanus isn’t transmitted person-to-person by sneezing or coughing like the measles, but comes from bacterial spores found in the environment.

Tetanus spores exist everywhere, particularly in the soil. When an unvaccinated person gets a deep, penetrating wound, those spores can invade the cut and begin producing the bacteria that causes the illness. The tetanus bacterium secretes a toxin that gets into the bloodstream and latches on to the nervous system.

Anywhere from three to 21 days after infection, symptoms appear: muscle spasms, lockjaw, difficulty swallowing and breathing and seizures. The disease can cause death or severe disability in those who survive, Schaffner said.

About 30 people contract tetanus each year nationwide, according to the CDC, and 16 died of it between 2009 and 2015. It’s rare among children; those over 65 are the most vulnerable.

In the case in Oregon, the boy cut his forehead while playing and his family stitched up the wound themselves. Six days later, he began clenching his jaw, arching his neck and back and had uncontrollable muscle spasms. When he began to have trouble breathing, his parents called paramedics and he was transported by air to Oregon Health & Science University in Portland. When he arrived, he asked for water but could not open his mouth.

The child was sedated, put on a ventilator and cared for in a darkened room while wearing ear plugs because any stimulation made his pain and muscle spasms worse. His fever spiked to almost 105F (40.5C) and he developed high blood pressure and a racing heartbeat.

Forty-four days after he was hospitalized, the boy was able to sip clear liquids. Six days later, he was able to walk a short distance with help. After another three weeks of inpatient rehabilitation and a month at home, he could ride a bike and run – a remarkable recovery, experts said.

The child’s care, not including the air ambulance and inpatient rehabilitation, cost nearly $1m, about 72 times the mean for a pediatric hospitalization in the US, the paper noted.

“The way to treat tetanus is you have to outlast it. You have to support the patient because this poison links on chemically and then it has to be slowly metabolized,” Schaffner said.

Cases of tetanus have dropped by 95% in the US since widespread childhood vaccination and adult booster shots became routine nearly 80 years ago; deaths have dropped 99%.

The CDC recommends a five-dose series of tetanus shots for children between the ages of two months and six years and a booster shot every 10 years for adults.