Long COVID sufferer Nuria Sepulveda, a 44-year-old self-employed worker who co-owns a courier franchise, poses for a photograph taken through blue plastic, in Madrid, Spain, April 9, 2021. The photograph was taken through blue plastic to visualise the effects of long COVID. Sepulveda got sick on March 12, 2020, during the first wave of the disease, and she had to visit the emergency room on several occasions for symptoms that ended up being diagnosed as double pneumonia, bowel bleeding and urine infection among others. She tried to return to work in November, but the fatigue was so overwhelming that "3 hours of work felt like a 12-hour work day." An avid sports practitioner, she remembers the exact date her body gave her some relief to get back on the bicycle. "When I felt the fatigue that had been dragging me down for months was getting a bit better, I got my bike out. It was September, 28. I will never forget it, it was the first day I was able to practice sports again. I couldn't help crying," she said. Sepulveda believes we have two lives, the second one starts when we realise we only have one. REUTERS/Susana Vera SEARCH "SPAIN LONGCOVID" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

A wheel of a bicycle belonging to long COVID sufferer Nuria Sepulveda, a 44-year-old self-employed worker who co-owns a courier franchise, is seen photographed through blue plastic, in Madrid, Spain, April 9, 2021. The photograph was taken through blue plastic to visualise the effects of long COVID. Sepulveda got sick on March 12, 2020, during the first wave of the disease, and she had to visit the emergency room on several occasions for symptoms that ended up being diagnosed as double pneumonia, bowel bleeding and urine infection among others. She tried to return to work in November, but the fatigue was so overwhelming that "3 hours of work felt like a 12-hour work day." An avid sports practitioner, she remembers the exact date her body gave her some relief to get back on the bicycle. "When I felt the fatigue that had been dragging me down for months was getting a bit better, I got my bike out. It was September, 28. I will never forget it, it was the first day I was able to practice sports again. I couldn't help crying," she said. Sepulveda believes we have two lives, the second one starts when we realise we only have one. REUTERS/Susana Vera SEARCH "SPAIN LONGCOVID" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

A combination picture shows long COVID sufferer Nuria Sepulveda, a 44-year-old self-employed worker who co-owns a courier franchise, posing for a photograph taken through blue plastic, and a wheel of her bicycle photographed through blue plastic, in Madrid, Spain, April 9, 2021. The photographs were taken through blue plastic to visualise the effects of long COVID. Sepulveda got sick on March 12, 2020, during the first wave of the disease, and she had to visit the emergency room on several occasions for symptoms that ended up being diagnosed as double pneumonia, bowel bleeding and urine infection among others. She tried to return to work in November, but the fatigue was so overwhelming that "3 hours of work felt like a 12-hour work day." An avid sports practitioner, she remembers the exact date her body gave her some relief to get back on the bicycle. "When I felt the fatigue that had been dragging me down for months was getting a bit better, I got my bike out. It was September, 28. I will never forget it, it was the first day I was able to practice sports again. I couldn't help crying," she said. Sepulveda believes we have two lives, the second one starts when we realise we only have one. REUTERS/Susana Vera SEARCH "SPAIN LONGCOVID" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

A military dog sniffs a urine sample during a demonstration to detect the coronavirus disease (COVID-19), at an army veterinary hospital in New Delhi, India, February 9, 2021. REUTERS/Adnan Abidi

A military dog sniffs urine samples during a demonstration to detect the coronavirus disease (COVID-19), at an army veterinary hospital in New Delhi, India, February 9, 2021. REUTERS/Adnan Abidi

Urinals are blocked to maintain social distancing at a toilet inside a shopping mall amidst the spread of the coronavirus disease (COVID-19) in Mumbai, India, October 8, 2020. REUTERS/Francis Mascarenhas

A view shows taped urinals at a restroom, amid the coronavirus disease (COVID-19) outbreak, in St Albans, Britain September 23, 2020. REUTERS/Peter Cziborra

The boys bathroom urinals are taped off for physical distancing at Hunter's Glen Junior Public School, part of the Toronto District School Board (TDSB), a day before classes reopen for the first time since the beginning of the coronavirus disease (COVID-19) pandemic in Scarborough, Ontario, Canada September 14, 2020. Picture taken September 14, 2020. Nathan Denette/Pool via REUTERS

A worker applies tape markings on urinals to encourage social distancing at a shopping mall after authorities allowed malls to reopen as India eases lockdown restrictions that were imposed to slow the spread of the coronavirus disease (COVID-19), in Ahmedabad, India, June 8, 2020. REUTERS/Amit Dave

An urinal is blocked due to social distancing at one of the restrooms of U.S. auto part maker Lear Corp., as part of the new security measures at the plant before resuming operations during the coronavirus disease (COVID-19) outbreak, in Ciudad Juarez, Mexico, May 27, 2020. Picture taken May 27, 2020. REUTERS/Jose Luis Gonzalez

Urinals are seen closed off at St. Joseph's Catholic Primary School as they prepare to reopen following the outbreak of the coronavirus disease (COVID-19), Hertford, Britain, May 29, 2020. REUTERS/Andrew Couldridge

Signs reminding patrons to practice social distancing are seen on urinals at a toilet of Japan's supermarket group Aeon's shopping mall as the mall reopens amid the coronavirus disease (COVID-19) outbreak in Chiba, Japan May 28, 2020. REUTERS/Kim Kyung-Hoon

Urinals partially blocked to maintain hygiene distance are seen at the Wannsee lido, on the opening day of the pool season, amid the coronavirus disease (COVID-19) outbreak in Berlin, Germany, May 25, 2020. REUTERS/Fabrizio Bensch

Urinals are pictured at the Central World department store after the Thai government eased isolation measures to prevent the spread of the coronavirus disease (COVID-19) in Bangkok, Thailand, May 17, 2020. REUTERS/Athit Perawongmetha

A plastic bag is placed between urinals in order for workers to distance themselves at a construction site in Brussels during the lockdown imposed by the Belgian government to slow down the coronavirus disease (COVID-19) spread, in Brussels, Belgium April 20, 2020. Picture taken April 20, 2020. REUTERS/Francois Lenoir

a row of urinals with tape markings to encourage social distancing is pictured, after the outbreak of coronavirus disease (covid-19), at a mall in Singapore March 31, 2020. REUTERS/Edgar Su

Golden urinals stand inside Chinese businessman Kang Quiang's casino Dong Yuan, in Sihanoukville, Cambodia, February 28, 2020. REUTERS/Jorge Silva SEARCH "COVID-19 CAMBODIA CASINOS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Urinals are pictured with some blocked off in order for people to distance themselves at motorway services on the M20, as the spread of the coronavirus disease (COVID-19) continues, Maidstone, Britain, March 26, 2020. REUTERS/John Sibley

Members of All India Hindu Mahasabha attend a gaumutra (cow urine) party, which according to them helps in warding off coronavirus disease (COVID-19), in New Delhi, India March 14, 2020. REUTERS/Danish Siddiqui

A member of All India Hindu Mahasabha holds an idol of a cow after drinking cow urine during a gaumutra (cow urine) party, which according to them helps in warding off coronavirus disease (COVID-19), in New Delhi, India March 14, 2020. REUTERS/Danish Siddiqui

Members of All India Hindu Mahasabha serve a traditional drink with cow urine as an ingredient during a gaumutra (cow urine) party, which according to them helps in warding off coronavirus disease (COVID-19), in New Delhi, India March 14, 2020. REUTERS/Danish Siddiqui

A policeman stands guard next to a caricature as members of All India Hindu Mahasabha attend a gaumutra (cow urine) party, which according to them helps in warding off coronavirus disease (COVID-19), in New Delhi, India March 14, 2020. REUTERS/Danish Siddiqui

Members of All India Hindu Mahasabha drink cow urine as they attend a gaumutra (cow urine) party, which according to them helps warding off coronavirus disease (COVID-19), in New Delhi, India March 14, 2020. REUTERS/Danish Siddiqui

Members of All India Hindu Mahasabha offer cow urine to a caricature of the coronavirus as they attend a gaumutra (cow urine) party, which according to them helps in warding off coronavirus disease (COVID-19), in New Delhi, India March 14, 2020. REUTERS/Danish Siddiqui TPX IMAGES OF THE DAY

Water rinses from a urinal of the Freiherr-vom-Stein secondary school in Bonn, amid authorities' discussions whether schools should be closed nationwide due to the coronavirus disease (COVID-19), in Bonn, Germany March 13, 2020. REUTERS/Wolfgang Rattay

Urinals of the Freiherr-vom-Stein secondary school in Bonn are pictured, amid authorities' discussions whether schools should be closed nationwide due to the coronavirus disease (COVID-19), in Bonn, Germany March 13, 2020. REUTERS/Wolfgang Rattay

A man urinates on the boundary wall of quarantine center where Nepalese arriving from coronavirus-stricken Chinese city of Wuhan is kept in Bhaktapur, Nepal February 17, 2020. REUTERS/Navesh Chitrakar

Urinals are filled with volcanic ash in a closed park in Tagaytay City, Philippines, January 14, 2020. REUTERS/Eloisa Lopez

Director general of the Bolshoi Theatre Vladimir Urin attends a news conference ahead of the International Contemporary Dance Festival DANCEINVERSION in Bolshoi Theatre in Moscow, Russia September 10, 2019. REUTERS/Shamil Zhumatov

A mother elephant urinates while baby observes at Kaudulla national park in Habarana, Sri Lanka August 6, 2019. Picture taken August 6, 2019. REUTERS/Dinuka Liyanawatte

A urinal is seen in the basement near a sign pointing towards a bomb shelter at the Central Bus Station in Tel Aviv, Israel May 25, 2019. REUTERS/Corinna Kern SEARCH "ISRAEL BUS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Dr Dyllon Randall holds a bio-brick made from urine at the University of Cape Town, in Cape Town, South Africa November 2, 2018. The odourless, grey prototype brick was grown in a mould in the lab over eight days and is the final product in a process that also produces fertilisers. REUTERS/Mike Hutchings

Researchers Dr Dyllon Randall, Suzanne Lambert and Vukheta Mukhari stand with a bio-brick made from urine at the University of Cape Town, in Cape Town, South Africa November 2, 2018. The odourless, grey prototype brick was grown in a mould in the lab over eight days and is the final product in a process that also produces fertilisers. REUTERS/Mike Hutchings

Researchers Suzanne Lambert and Vukheta Mukhari stand beside a bio-brick made from urine at the University of Cape Town, in Cape Town, South Africa, November 2, 2018. The odourless, grey prototype brick was grown in a mould in the lab over eight days and is the final product in a process that also produces fertilizers. REUTERS/Mike Hutchings

Researcher Suzanne Lambert sits beside a bio-brick made from urine at the University of Cape Town, in Cape Town, South Africa, November 2, 2018. The odourless, grey prototype brick was grown in a mould in the lab over eight days and is the final product in a process that also produces fertilizers. REUTERS/Mike Hutchings

A journalist poses as he stands in front of a bright red, eco-friendly urinal on the Ile Saint-Louis along the Seine River in Paris, France, August 13, 2018. REUTERS/Philippe Wojazer

A journalist poses as he stands in front of a bright red, eco-friendly urinal on the Ile Saint-Louis along the Seine River in Paris, France, August 13, 2018. REUTERS/Philippe Wojazer

A couple walks near a bright red, eco-friendly urinal on the Ile Saint-Louis along the Seine River in Paris, France, August 13, 2018. REUTERS/Philippe Wojazer

A counter-protester holds a bottle of urine to throw, near a white nationalist-led rally marking the one year anniversary of the 2017 Charlottesville ‘Unite the Right’ protests, in Washington, D.C. August 12, 2018. REUTERS/Lucas Jackson

A pot containing a urine bag is pictured at an obstetric fistula repair centre in Maiduguri, Nigeria August 1, 2018. Picture taken August 1, 2018. REUTERS/Afolabi Sotunde

Russia's President Vladimir Putin, FIFA President Gianni Infantino, Director General of the Bolshoi Theatre Vladimir Urin and other guests watch a gala concert at the Bolshoi Theatre on the eve of the soccer World Cup final match in Moscow, Russia July 14, 2018. Yuri Kodobnov/Pool via REUTERS

Soccer Football - World Cup - England fans watch Croatia v England - Brighton Beach, Brighton, Britain - July 11, 2018 Fans urinate in the sea during the match REUTERS/Toby Melville

An urinal filter designed in the likeness of a soccer field with a goal post and a ball is pictured in a men's room of a public toilet in Shanghai, China July 10, 2018. REUTERS/Aly Song

A urinal with a soccer goal is seen in a hotel in Saint Petersburg, Russia June 20, 2018. As well as shooting all the matches, Reuters photographers are producing pictures showing their own quirky view from the sidelines of the World Cup. Picture taken June 20, 2018. REUTERS/Sebastian Rocandio

A urinal with a soccer goal inside is seen in a hotel in Saint Petersburg, Russia, June 20, 2018. As well as shooting all the matches, Reuters photographers are producing pictures showing their own quirky view from the sidelines of the World Cup. REUTERS/Sebastian Rocandio

Urine crystals grow on a piece of material, as part of a collection by Alice Potts that imagines a future where accessories are grown from our bodily excretions, in the Royal College of Art Fashion Show in London, Britain, June 14, 2018. Picture taken June 14, 2018. REUTERS/Stuart McDill

Urine crystals grow on a piece of material, as part of a collection by Alice Potts that imagines a future where accessories are grown from our bodily excretions, in the Royal College of Art Fashion Show in London, Britain, June 14, 2018. Picture taken June 14, 2018. REUTERS/Stuart McDill

A dog stands near a goalpost in Ryazantsevo settlement in Yaroslavl region, Russia, May 13, 2018. REUTERS/Sergei Karpukhin SEARCH "RUSSIA GOAL POSTS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Urine sample collection during the ceremonial start of the Iditarod dog sled race in Anchorage, Alaska, U.S. March 3, 2018. REUTERS/Mark Meyer

A dog from Misha Mijes's team submits to urine sampling before the ceremonial start of the Iditarod dog sled race in Anchorage, Alaska, U.S. March 3, 2018. REUTERS/Mark Meyer

Martha Dobson a volunteer for the P-Team, collects urine samples during the ceremonial start of the Iditarod dog sled race in Anchorage, Alaska, U.S. March 3, 2018. REUTERS/Mark Meyer

Karelys Betancourt (L), who is traveling by bus from Caracas to Chile, smiles after seeing a man urinate next to the bus in Huarmey, Peru, November 12, 2017. Karelys, 25, who dreams of launching a chocolate business, packed sweet moulds into her suitcase. REUTERS/Carlos Garcia Rawlins SEARCH "RAWLINS BUS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A reveller (L) urinates as a friend (R) vomits on a street at an annual block party known as "Academicos do Baixa Augusta" (Academics of Baixa Augusta neighbourhood ), during carnival festivities in Sao Paulo, Brazil, February 4, 2018. REUTERS/Nacho Doce

An athlete's A and B-samples of urine, with the new green seal to be used at the Olympics, still on the B-sample, are labeled to be tested at the Doping Control Laboratory, at the National Institute of Scientific Research Centre (INRS) Institute Armand-Frappier in Laval, Quebec, Canada January 15, 2018. REUTERS/Christinne Muschi

Urine samples from athletes are stacked after being tested at the Doping Control Laboratory at the National Institute of Scientific Research Centre (INRS) Institute Armand-Frappier in Laval, Quebec, Canada January 15, 2018. REUTERS/Christinne Muschi

Urine samples from athletes are lined up for steroid profiling at the Doping Control Laboratory at the National Institute of Scientific Research Centre (INRS) Institute Armand-Frappier in Laval, Quebec, Canada January 15, 2018. REUTERS/Christinne Muschi

A technician tests urine samples from athletes, at the Doping Control Laboratory, at the National Institute of Scientific Research Centre (INRS) Institute Armand-Frappier in Laval, Quebec, Canada January 15, 2018. REUTERS/Christinne Muschi

A technician tests urine samples from athletes, at the Doping Control Laboratory, at the National Institute of Scientific Research Centre (INRS) Institute Armand-Frappier in Laval, Quebec, Canada January 15, 2018. REUTERS/Christinne Muschi

A technician tests urine samples from athletes, at the Doping Control Laboratory, at the National Institute of Scientific Research Centre (INRS) Institute Armand-Frappier in Laval, Quebec, Canada January 15, 2018. REUTERS/Christinne Muschi

A technician tests urine samples from athletes, at the Doping Control Laboratory, at the National Institute of Scientific Research Centre (INRS) Institute Armand-Frappier in Laval, Quebec, Canada January 15, 2018. REUTERS/Christinne Muschi