Health
WHO Investigation Ends Without Clear Answer on COVID-19 Origins
More than four years after the onset of the COVID-19 pandemic, the World Health Organization (WHO) has concluded its official investigation into the virus’s origins—without identifying a definitive source.
In its final report, the WHO-convened Scientific Advisory Group for the Origins of Novel Pathogens (SAGO) said it could not determine how the SARS-CoV-2 virus first entered the human population. The report, published this week, reflects a deadlock in efforts to trace the source of the pandemic, which has killed more than 20 million people and caused massive global disruption.
Speaking at a press conference, Marietjie Venter, the group’s chair, said that the majority of available scientific evidence continues to support the theory that the virus likely originated in animals before jumping to humans. This is consistent with the findings of the initial 2021 WHO-China joint study, which suggested that the virus may have passed from bats to humans via an intermediate animal species.
However, the report also acknowledged that a laboratory-related incident could not be definitively ruled out, largely because investigators lacked access to key data from China. “Despite multiple requests, we were not given the necessary genetic sequences or biosecurity documentation to assess this possibility,” said Venter. “As a result, the lab origin hypothesis remains unproven but cannot be excluded.”
The group faced internal divisions as well. One member resigned just before the report’s release, while three others requested their names be removed. The report reflects these disagreements, noting the lack of consensus among the 27 experts.
Venter also clarified that there is currently no credible scientific evidence supporting claims that the virus was engineered or intentionally released. Moreover, the group found no indication that COVID-19 was spreading outside China before December 2019.
WHO Director-General Dr. Tedros Adhanom Ghebreyesus called the inconclusive findings “disappointing but not surprising,” and said the world has a “moral imperative” to continue searching for the virus’s origin. “Understanding how this pandemic began is essential to prevent future outbreaks,” he said.
Efforts to investigate the virus’s origins have been hampered by political tensions and restricted access to information. The Associated Press previously reported that Chinese authorities halted both domestic and international efforts to investigate the origins in early 2020. While the Chinese government has dismissed suggestions of a lab leak, it has also resisted calls for broader international inquiries.
Last year, scientists identified several animals—such as raccoon dogs, civet cats, and bamboo rats—that may have played a role in transmitting the virus to humans, but definitive evidence remains elusive.
For now, the origins of COVID-19 remain unknown, and scientists say more cooperation and transparency will be needed to solve one of the most pressing scientific mysteries of the 21st century.
Health
World Cup Emotion Can Strain the Heart, Cardiologists Warn Fans at Risk
As the World Cup begins, medical experts are cautioning football fans with underlying heart conditions that the emotional intensity of matches can place unexpected strain on the cardiovascular system.
Cardiologists say that the excitement, tension, and anxiety generated during high-stakes games can trigger physical reactions similar to intense exercise, raising heart rate, blood pressure, and stress hormones.
“Intense emotions, whether positive or negative, can act as ‘precipitating risk factors’ for cardiovascular events such as heart attack,” said Paola Santalucia, a cardiologist and board member of the European Heart Network.
She explained that moments of extreme excitement, such as a decisive penalty shootout or a last-minute goal, may pose risks for people already living with heart disease. Those with additional risk factors, including hypertension, obesity, or smoking habits, are also advised to be cautious during emotionally charged matches.
Research using wearable devices has shown that during major football events, some fans experience heart rates climbing as high as 150 beats per minute. That level is comparable to sprinting and reflects how strongly the body reacts to emotional stress.
A study examining supporters during the 2025 German Cup final found that even watching from home can significantly affect physiological responses. “They still had an increase in heart rate that compares to walking, even though they didn’t walk,” said Christian Deutscher, professor of sports economics at Bielefeld University and co-author of the study.
He noted that the most intense reactions often occur not during goals themselves, but during moments of uncertainty such as VAR checks, penalty shootouts, or shots striking the post. These unpredictable situations, he said, are what drive the strongest emotional and physical responses among fans.
Deutscher also pointed out that stadium spectators may experience even greater strain due to environmental factors such as heat and alcohol consumption.
However, experts emphasize that football itself is not inherently dangerous. Instead, it is the body’s natural response to excitement that can create temporary stress.
“The adrenergic stimulation is at its max: extreme high blood pressure, high heart rate, and adrenaline, cortisol, skyrocketing,” said Dan Atar, professor of cardiology at Oslo University Hospital. In rare cases, he added, this surge can contribute to the rupture of arterial plaque in vulnerable individuals, potentially leading to a heart attack.
Atar stressed that such events can occur in everyday situations as well, including physical exertion like shoveling snow. “It is in no way dangerous to watch a football game,” he said. “All this is physiologic. It’s not dangerous to be excited.”
Still, he acknowledged that combining emotional stress with alcohol, heat, and pre-existing conditions can increase risk for some viewers.
Doctors advise those at higher risk to continue prescribed medications, limit alcohol intake, avoid smoking, and watch for warning signs such as chest pain or irregular heartbeat.
“The key message is not to avoid enjoying the match, but to do so with moderation and awareness,” Santalucia said.
Health
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Health
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