The many faces of health workers around the globe fighting coronavirus

(CNN) -- While the world collectively shelters in place to protect against coronavirus, medical professionals flock to the front lines to work long hours tending to a burgeoning number of infected people.

One of them is Dr. Nicola Sgarbi, 35, who unknowingly became part of a growing photo trend of health workers coping with this exponential rise in sick patients.

Italy has been indicative of the spike in infections. On Saturday, the country had more than 47,000 coronavirus cases and some 4,000 deaths from the disease. Sgarbi is a doctor in training who works in the ICU of the civil hospital of Baggiovara in Modena, Italy.

Track live coronavirus updates in the US, globally with real-time maps of confirmed cases, deaths

Almost everything about Sgarbi's shift on March 13 was part of his new normal since the outbreak: working 12 hours to treat Covid-19 patients while wearing protective equipment. But at about 8 p.m. that day, he stripped off his face mask and snapped a quick selfie, something he rarely does.

"I mainly took the photo for two reasons. Firstly, to send it to my partner, to tell her that I had finished my shift at work and that I was on my way home, slightly bruised," Sgarbi told CNN over email. "Secondly, to show it to my 1-year-old daughter when she will have grown up. I will be telling her about this moment."

Sgarbi's photo was posted on Facebook and Reddit, where it was shared more than 74,000 times and voted on at least 118,000 times, respectively. The photo drew worldwide praise and comparisons to "Batman and Superman rolled into one," among other things.

What you need to know today about the virus outbreak

Since then, numerous photos and stories of health workers in and out of protective gear have been posted around the internet. Each one captures the physical and emotional toll this pandemic is taking.

Sherry Dong, 25, is a registered nurse who has worked in the medical ICU at Johns Hopkins Hospital in Baltimore for more than two years. On Friday, she shared a photo on Reddit taken during a hectic day at work. The photo shot to the top of Reddit's front page and collected more than 2,100 comments.

"My heart is grateful and my mind is heavy seeing medical professionals all over the world putting themselves at risk battling against this outbreak. I think the medical community has found various ways of coping through social media outlets," Dong told CNN in a Reddit message.

"Our uniformed readers should make sure they do not contribute to the growing problem of supply shortages (ie: N95 masks, face masks, disinfectants, gloves, etc.) and consider donating to local hospitals," she said.

Some of the most striking photos have come out of Wuhan, China, the epicenter of Covid-19.

These are all the Texas cities and counties that have issued stay-at-home orders

A portrait was taken on February 17 of the marks left on the face of nurse Cao Shan after working in the isolation ward in Wuhan's Jinyintan Hospital, designated for coronavirus patients.

"She and her husband, a doctor also working at the hospital, have slept in the vehicle for 23 nights to avoid bringing viral hazards around, save commuting time, and give their assigned nearby hotel room to colleagues," the photo caption read.

These photos are an important oral tradition that will hopefully provide a cautionary tale to the general public, said Dr. Anna Yaffee, director of the Global Health in Emergency Medicine Section at Emory University. Yaffee hopes these images are a powerful reminder of the realities health care professionals face on the front lines every day.

"The general public may not be aware of the realities of health care in general and certainly not during this pandemic, but I hope that sharing the images reinforces the point that there are people out there who are working tirelessly around the clock to provide lifesaving supportive care to those who are sick, from coronavirus as well as from every other ailment," Yaffee told CNN through email.

"We aren't heroes, we are just doing our jobs, and right now our jobs are asking more of us in a time when we have fewer resources to work with. We are doing this because we care."

Sgarbi does not feel like a hero. He's just a "normal person who loves his job and who, now more than ever, is proud and proud to do it by giving all himself," he wrote on Facebook.

“I have never seen something quite like this in my career,” Sgarbi told CNN. “I believe that in order to get through this extremely demanding time, we need the effort and commitment of each and every one of us.”

MORE CORONAVIRUS COVERAGE FROM KSAT:

• Explained: San Antonio, Bexar County issue ‘Stay Home, Work Safe’ order. Here’s what that means.
• Here’s what we know about the confirmed COVID-19 cases in San Antonio
• Map: Track COVID-19 cases in Texas, county-by-county updates
• ‘We have community transmission now.’ Bexar County changes tactics from containment to mitigation
• Unemployment claims are soaring. What to do if you lose your job
• Map: Where San Antonio-area students can find free school meals during closures
• Texas governor bans dine-in eating, gatherings of 10+ through April 3
• SAQ: Your coronavirus questions answered
• Explained: New declarations of emergency issued in San Antonio and Bexar County
• 8 ways to help your fellow San Antonians during coronavirus pandemic
• The ultimate coronavirus guide: From preparedness and prevention to testing and treatment
• Track live coronavirus updates in the US, globally with real-time maps of confirmed cases, deaths
• Social distancing and hungry? These San Antonio-area restaurants are offering To-Go deals