A health worker treats a gravely ill patient at the Ajusco Medio General Hospital which is designated for COVID-19 cases only, in Mexico City, Tuesday, Aug. 31, 2021. Credit: AP Photo/Marco Ugarte

Israel Buendía sat up in the bed closest to the window, a machine forcing oxygen into his nose. He'd been at the Hospital Ajusco Medio for two weeks and now he was marveling at the sound of his own voice.

Just last Friday, Buendía had felt good too. He bathed, walked the hall a bit. Then he started to cough and couldn't stop. By the afternoon, doctors had positioned him facedown in bed to ease his breathing. He spit blood.

"He was about to be intubated," Dr. Susana Valdez, head of internal medicine, said this week.

Such is the roller coaster of COVID-19 for many patients. The pandemic has played out in similar peaks and valleys in Mexico over the past year and half. The country is now in the middle of its third wave of infections, a surge that began in mid-June and is just beginning to show signs of easing.

Ajusco Medio sits in a mountainside neighborhood on Mexico City's south side. Designated early on to handle only COVID-19 patients, the public hospital has treated more than 62,000. On Tuesday, its intensive care unit was at 99% capacity. The 96-bed temporary hospital wing that it built in the hospital's parking deck below the main tower was at 99.6% capacity, with one open bed.

There, bed after bed of COVID-19 patients were monitored by doctors and nurses, specialists and even a psychologist. Some waited for a bed in the tower to open, while others hoped they would never have to receive that higher-level care.

A health worker wears a protective mask and goggles at the Ajusco Medio General Hospital which is designated for COVID-19 cases only, in Mexico City, Tuesday, Aug. 31, 2021. Credit: AP Photo/Marco Ugarte

That temporary wing—the staff call it the UTAM—was not supposed to house intubated patients, just those receiving high-volume oxygen like Buendía up in the tower, but on Tuesday intubated patients abounded.

"There shouldn't be tubes here," hospital director Dr. Jesús Ortiz said during a walk through the UTAM. "The (UTAM) wasn't made for more than high-flow points, however the aggressiveness of the (infection) curve beat us."

Most of the patients now filling Ajusco Medio's beds arrived in a wave two weeks ago or more. The staff was encouraged that this week new admissions had slowed. "It appears we are in the decline of the pandemic curve," Ortiz said.

Still, patients were trickling in from other parts of the sprawling city and even other states, drawn by the hospital's hard-earned reputation as a place where COVID-19 patients got better.

Health workers walk around the entrance of the Ajusco Medio General Hospital which is designated for COVID-19 cases only, in Mexico City, Tuesday, Aug. 31, 2021. Credit: AP Photo/Marco Ugarte

Assistant Health Secretary Hugo López-Gatell, the Mexican government's pandemic point person, confirmed as much Tuesday.

"The epidemic curve of estimated cases began to decline a month ago and today we have clear signs that it is in a process of reduction and we anticipate that that reduction is going to continue over the coming weeks," he said during President Andrés Manuel López Obrador's daily news conference.

The health official said 30 of Mexico's 32 states had declining epidemic curves.

Mexico has suffered more than 260,000 test-confirmed deaths from COVID-19. But because so little testing is done, official excess-death counts suggest the real toll is closer to 400,000.

A difference with this latest wave of infections was that Mexico's vaccination campaign was well underway. So far, nearly 34 million people have been fully vaccinated and more than 23.8 million have been partially vaccinated.

Medical staff cheer as Sergio del Rio, 56, rings the bell as he he released from the Ajusco Medio General Hospital which is designated for COVID-19 cases only, in Mexico City, Tuesday, Aug. 31, 2021. Credit: AP Photo/Marco Ugarte

Another difference this time is that hospitals like Ajusco Medio are seeing more children than they have in the previous waves. That appears to be due to the more contagious delta variant, which Ortiz said accounts for about 80% of the patients they have sampled.

The staff had grown accustomed to seeing long lines of adults waiting beside their outdoor triage area, but suddenly there were adults holding children by the hand, Ortiz said.

"We weren't prepared for these children," Ortiz said, noting that those cases were harder on the staff. "Now we can see 50, 60 children coming to the hospital to be evaluated in a shift."

With Mexico's return to in-person classes this week, there is concern that those numbers could swell in the coming weeks.

Dr. Cynthia Karina Portillo González, the hospital's head of pediatrics, said they've seen children of all ages. Nearly all come after an adult in their home is infected, she said.

Health workers treat patients at the Ajusco Medio General Hospital which is designated for COVID-19 cases only, in Mexico City, Tuesday, Aug. 31, 2021. Credit: AP Photo/Marco Ugarte

"We're preparing ourselves," Portillo said. "The number of patients will probably increase. We hope not."

Portillo and Dr. Daniela Fernández were closely watching a 16-year-old girl who had arrived from another hospital a day earlier. She lay face down and motionless on a bed receiving high-flow oxygen through tubes in her nose.

Her family had started treating her at home then took her to another hospital where her condition deteriorated, Fernández said. Then she was transferred to Ajusco Medio, where her condition had stabilized but was still considered "delicate."

Fernández said their pediatric load was three times what it had been. Motioning to the ward, she said that with the return to schools, "In two weeks we're going to see this pretty full."

Around lunchtime on Tuesday, Sergio del Río was pushed in a wheelchair to the entrance of the UTAM. He rang a bell mounted there for discharged patients while the staff applauded.

  • A patient waits in the COVID-19 testing area of the Ajusco Medio General Hospital which is designated for COVID-19 cases only, in Mexico City, Tuesday, Aug. 31, 2021. Credit: AP Photo/Marco Ugarte

  • A health worker treats a gravely ill patient at the Ajusco Medio General Hospital which is designated for COVID-19 cases only, in Mexico City, Tuesday, Aug. 31, 2021. Credit: AP Photo/Marco Ugarte

  • Health workers treat a gravely ill patient at the Ajusco Medio General Hospital which is designated for COVID-19 cases only, in Mexico City, Tuesday, Aug. 31, 2021. Credit: AP Photo/Marco Ugarte

  • Health workers bring in a gravely ill patient at the Ajusco Medio General Hospital which is designated for COVID-19 cases only, in Mexico City, Tuesday, Aug. 31, 2021. Credit: AP Photo/Marco Ugarte

  • The director of the Ajusco Medio General Hospital which is designated for COVID-19 cases only, Dr. Jesus Ortiz, walks in the hallways of the hospital in Mexico City, Tuesday, Aug. 31, 2021. Credit: AP Photo/Marco Ugarte

  • Sergio del Rio, 56, embraces his wife after he recovered and was released from the Ajusco Medio General Hospital which is designated for COVID-19 cases only, in Mexico City, Tuesday, Aug. 31, 2021. Credit: AP Photo/Marco Ugarte

His wife Teresa arrived in a white SUV and when Sergio shuffled out the door they wrapped each other in a long embrace.

"I feel renewed," Del Río said after 16 days in the hospital. "I arrived not being able to breathe and now, well, I wouldn't run a marathon, but at least I could go down to the garage."