In late January, there were reports that the new coronavirus could begin to spread before it began to spread, which was shocking news at the time. At the time, there were fewer than 3,000 confirmed cases, most of them in China. Less than a week later, nearly 25,000 cases were registered, but public health officials said it was impossible for the virus to spread until symptoms appeared. Today, we have nearly 1 million cases worldwide, and the death toll is approaching 50,000. The U.S. Centers for Disease Control and Prevention has just released a study that says asymptomatic COVID-19 patients can spread the disease.
The new study looked at 243 coVID-19 cases reported in Singapore between 23 January and 16 March. The researchers observed seven groups of cases, of which “asymptomatic pre-transmission is the most likely explanation for the occurrence of secondary cases.”
Here are two examples of what propagation may look like before asymptomatic:
A. A 55-year-old woman (patient A1) and a 56-year-old male (patient A2) from Wuhan, China, arrived in Singapore on 19 January. They visited a local church on the same day and developed symptoms on 22 January (patient A1) and 24 January (patient A2). Three others, a 53-year-old male (patient A3), a 39-year-old woman (patient A4) and a 52-year-old woman (patient A5), also went to the same church on the same day, followed by symptoms on 23 January, 30 January and 3 February. Patient S5 and patients A1 and A2 occupied the same seat in the church earlier in the day (filmed by closed-circuit cameras) (5). Surveys of other participants did not find that anyone with other symptoms had visited the church that day.
Group B: On 15 February, a 54-year-old woman (patient B1) attended a dinner party at which she came across a patient diagnosed with COVID-19. On 24 February, patient B1 and a 63-year-old woman (patient B2) took part in the same singing class. Two days later (26 February), patient B1 developed symptoms;
In other words, if you carry the new SARS-CoV-2 virus, you have a good chance of infecting others before you show any signs of infection yourself.
We already know that many COVID-19 patients don’t even have any symptoms, and their immune systems can fight the infection without any help. But these people are still contagious and can transmit the disease to those around them. That’s why governments around the world are letting most people stay at home longer to reduce the risk of transmission. New research suggests that all patients, whether or not they show symptoms of COVID-19, are likely to pass it on to others before they suspect they have a disease.
The study warns medical professionals to consider the possibility of asymptomatic pre-spread while trying to track infections, and the report states: “Public health officials who follow contact should give strong consideration to the possibility of pre-symptom transmission, including a period prior to the onsetting of symptoms.” “
The findings reinforce the idea that strong social diversion measures should be taken to limit the spread of the virus. The longer we stay indoors, the higher our immune system’s chances of killing the new coronavirus. If you develop symptoms, you should contact your doctor and follow the guidelines. Depending on the progress of your COVID-19 case, you may be told to be observed at home or may be taken to hospital.