A few months ago, monkeypox regularly made headlines as a major new disease outbreak. Then it largely vanished from the news.

What happened in the meantime? The virus receded: Since a peak in early August, reported monkeypox cases in the U.S. have fallen more than 85 percent through yesterday.

The rise and fall of monkeypox provide lessons on the spread of diseases — an aspect of public health that experts acknowledge we still know far too little about. Covid has made clear that much of the world was not prepared for a deadly pandemic. Monkeypox, while nowhere as dangerous as Covid, can shed light on our vulnerabilities (as my colleague Apoorva Mandavilli explained).

Today’s newsletter will look at why monkeypox declined, and what that might mean for future outbreaks.

Ultimately, monkeypox in the U.S. has been contained to a narrow demographic, mostly gay and bisexual men with multiple partners. It was never very deadly; there were just 28 confirmed deaths globally out of more than 72,000 reported cases. (I wrote earlier about the virus and how it spreads.)

Four factors explain monkeypox’s decline, experts said. First, vaccines helped slow the virus’s spread (despite a rocky rollout). Second, gay and bisexual men reduced activities, such as sex with multiple partners, that spread the virus more quickly.

The third reason is related: the Pride Month effect. Monkeypox began to spread more widely around June, when much of the world celebrated L.G.B.T.Q. Pride. Beyond the parades and rallies, some parties and other festivities involved casual sex. As the celebrations dwindled, so did the increased potential for monkeypox to spread.

And finally, the virus simply burned out. Monkeypox mainly spreads through close contact, making it harder to transmit than a pathogen that is primarily airborne, like the coronavirus. “Because of that, monkeypox is a self-limiting virus,” Apoorva told me. That made it less likely to grow into a larger outbreak.

Much of this explanation may sound familiar after more than two years of Covid: A virus can be tamed by vaccines and behavioral changes.

Another factor worth emphasizing: public health communication. During Covid, officials have sometimes given unclear or misleading guidance because they did not trust the public with the truth.

A similar phenomenon played out with monkeypox. Some officials were cautious about explicitly labeling monkeypox as a greater risk to gay and bisexual men and asking them to reduce risky sexual activities, out of fear of stigmatizing a population that already faces discrimination over AIDS.

New York City’s health department initially opposed recommending that gay and bisexual men reduce their number of sexual partners, arguing that L.G.B.T.Q. people have had “their sex lives dissected, prescribed and proscribed in myriad ways.” (Internally, the agency debated whether that was the right response.) Those concerns stopped officials from clearly communicating the dangers to the population most at risk.

Eventually, public health officials began tailoring their warnings toward gay and bisexual men. In late July, the World Health Organization’s director general said that men who have sex with men should consider limiting their number of sexual partners. The C.D.C. and New York City’s health department echoed the guidance.

And it appeared to work: Monkeypox cases began to decline. That shift in public messaging enabled two of the four factors I explained earlier, as officials targeted gay and bisexual men for vaccine drives, and men who have sex with men limited riskier activities.

But the clearer guidance came after weeks of criticism, exposing a habit of unclear messaging that keeps the country vulnerable to health crises.

For all we do know about monkeypox’s decline, there is much we don’t know. We are still in “the cave ages” in understanding the spread of viruses, Michael Osterholm, an epidemiologist at the University of Minnesota, has said.

Much of that lack of knowledge is related to the unpredictability of human behavior. Scientists can map viruses down to the atomic level but have a hard time guessing what people will do at any given point. And people are the ones spreading viruses, whether it’s Covid at Christmas parties or monkeypox at Pride celebrations.

That uncertainty opens the possibility that monkeypox could spread again. People most in danger of contracting the virus may skip the vaccine because its spread has slowed, or they could resume risky activities too soon, before cases are low enough to stop another outbreak. Or another major event, like next year’s Pride Month, could bring monkeypox back.

And the virus still regularly spreads in western and central Africa, where it was first found in humans and has never been fully contained — putting it one flight away from the U.S. or Europe. “I don’t see any progress on addressing that,” said Dr. Céline Gounder, a senior fellow at the Kaiser Family Foundation. (The U.S. is working with Japan to distribute more vaccine doses globally, Politico reported yesterday.)

The good news: This year’s outbreak has made officials take monkeypox more seriously. So if it does come back, the country may be more prepared to deploy vaccines and take other steps to fight it. But success depends on how people react.

  • “I was the one who had to educate doctors about monkeypox”: Five men told The Washington Post about what it was like to have the virus.

  • Federal regulators approved Covid booster shots for children 5 and older.

  • A woman’s father and brother bought into Covid conspiracy theories. A new Times podcast tells the story of their last weeks alive.

  • The Biden administration will offer up to 24,000 Venezuelans a legal path into the U.S. Those caught crossing illegally will be expelled to Mexico.

  • In New York, officials built tent shelters to house migrants, including some people sent by Texas.

Mystery: How did a World War II “ghost boat” end up in a shallow lake in California?

Pumping Iron: How to make strength training a habit.

Advice from Wirecutter: Prep for a power outage.

Lives Lived: Art Laboe, the “dean of Los Angeles rock ’n’ roll broadcasting,” got his first radio job as a teenager and was still on the air almost 80 years later. He died at 97.

Padres and Braves get to 1-1: Both N.L.D.S. series are tied after the Braves’ 3-0 win yesterday and San Diego’s upset 5-3 win in Los Angeles.

A free agent: The Los Angeles head coach Sean McVay said that the struggling Rams would offer the free agent wide receiver Odell Beckham Jr. a new contract.

From almost the start of the pandemic, public spaces were transformed into restaurants, wedding venues and dance floors. This fall, they’re becoming art exhibitions, too.

In New York, three gallery shows display works inspired by often-overlooked outdoor sites. One of them, “Life Between Buildings” at MoMA PS1, highlights artists who have turned cracks in the sidewalk, vacant lots and crumbling buildings into art.

In London, curators are turning parks and city squares into public galleries, placing sculptures that will remain visible for months or, in some cases, years. These free exhibitions offer an option for the many people who “are still wary about being in a gallery with crowds,” one London curator said.

And here’s today’s Wordle. After, use our bot to get better.

Thanks for spending part of your morning with The Times. See you tomorrow.

P.S. Ailee Yoshida, a high school student and Times Diverse Crossword Constructor fellow, is the youngest woman to publish a Times crossword.

Here’s today’s front page.

“The Daily” is about N, a teenager in Afghanistan. On the Modern Love podcast, parents and children seek connection.

Matthew Cullen, Lauren Hard, Lauren Jackson, Claire Moses, Ian Prasad Philbrick, Tom Wright-Piersanti and Ashley Wu contributed to The Morning. You can reach the team at themorning@nytimes.com.

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