Every week, it seems, the list of coronavirus symptoms from unbearable to fatal, from COVID toes to toxic tremors the list continues to grow larger.
What began as a familiar flu-like cluster of chiles, headaches, and fevers, has expanded rapidly over the past three months in the list of syndromes affecting most of the body's main organs.
New coronaviruses can also accelerate the immune system, indiscriminately attacking pathogens and their human hosts.
'Most viruses can cause disease in two methods,' explained Jeremy Rossman, a senior instructor in virology at the University of Kent.
'They can injure the tissue where the virus multiplies or they can cause the disease as an after effect of the immune system.'
Doctors suspect that Covid-19 has been diagnosed with a disorder similar to toxic shock syndrome in New York, London, and Paris in New York, London and Paris on the blood vessel walls behind more than 100 children and teenagers hospitalized in recent weeks. Attacks and can cause fever. Vomiting and in extreme cases organ failure.
Three deaths in New York State have been attributed to the so-called pediatric multi-system inflammatory syndrome, with the possibility of two others.
In adults, Covid-19 was linked to other life-threatening symptoms in dozens of medical studies, including stroke, heart damage, and brain inflammation.
Researchers from the Urology Department of Nature Medical University wrote in the Nature Review last week, describing severe urinary complications and severe kidney injuries in patients.
He also saw a dramatic change in male sex hormones.
'After recovery from Covid-19, young men who are interested in having children should receive counseling regarding their fertility,' He advised.
Cascading symptoms
Does this mean that Covid-19 causes a uniquely broad array of symptoms? Not necessarily, virologists and other experts say.
"If it is a common disease, even more, rare complications will occur," said Babak Javid, a consultant for infectious diseases at Cambridge University Hospitals.
Covid-19 cases worldwide have more than 4.1 million confirmed cases, but the exact number of infections - taking unspecified and asymptomatic infections - is "going to be in the tens, possibly hundreds of millions", he said.
'So if one-in-one, or even one-in-10,000, get complications, that's still thousands of people.'
Some rare symptoms associated with the new coronavirus also appear with influenza, which kills several million people worldwide each year, he said. But with one important difference: "Compared to influenza, you are more likely to become seriously ill, and die."
The confirmed Covid-19 death toll is rapidly approaching 300,000.
Frontline general practitioners have been the first to see the pattern as a worldwide epidemic spread from ground zero in central China in just a few weeks.
"Initially, we were told to watch out for headaches, fever, and mild coughs," recalls Sylvie Monnoy, a family doctor in central Paris.
'Then they added a runny nose and a throat. After that, digestive problems including abdominal pain and severe diarrhea.'
The list continued to grow: skin lesions, neurological problems, severe chest pain, loss of taste, and smell.
Sense of confusion
"We started thinking that we should doubt everything," Mononoy said, dressed in protective clothing from head to toe.
Some patients were so nervous they said they were afraid to touch or get close to anything.
An internal US Center for Disease Control (CDC) hospitalized 2,591 Covid-19 patients between March 1 and May 1 with a breakdown of symptoms.
Three-quarters of the patients experience cold, fever, and/or cough, with almost shortness of breath, these are by far the most common Covid-19 traits.
According to internal reports, about a third reported flu-like muscle aches, while 28 percent experienced diarrhea, and a quarter experienced nausea or vomiting.
Some 18 percent had a headache, while 10 to 15 percent had chest or abdominal pain, runny nose, sore throat and/or confusion.
Less than one percent of CDC cohorts had other symptoms, including seizures, rashes, and conjunctivitis.
Health officials have been slow to alert the public to potential effects.
Loss of smell
As of the end of April, the CDC listed only three on its website: cough, fever and shortness of breath. Updates include just a few more: chills, muscle aches, headaches, and loss of smell or taste.
Loss of smell and taste was found in only 3.5 percent of patients included in the CDC report, but experts suspect these symptoms are - for unknown reasons more common in less deadly cases where people were not hospitalized.
"I don't have any patients with these symptoms who had serious complications," said Mononoy.
Experts note the loss of taste and smell is extremely rare with other types of viruses.
Another group of symptoms found in flu patients arises from blood clots.
Heart problems, liver thrombosis, pulmonary throat, and brain damage in Covid-19 patients have been detected in recent studies.
'When someone is very ill with Covid-19, you may have problems with blood clots forming, and it seems to be a lot more common than other viral infections,' Javid said.
The third group of uncommon symptoms includes skin rash.
Dermatologist Graeme Leeper on the medical know-how website Medscape said, "The rashes associated with Covid seem very difficult.
A condition known as camouflage chilblains, or "Covid toes", has attracted the most attention, with photos on social media showing the discord as being frosty.
Like the loss of smell, symptoms which can cause painful itching and burning - are associated with benign forms of the virus.
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