Covid-19 transmission has been reported to occur between humans, but it is not certain whether it can be transmitted by a carrier without symptoms.
The following cases indicate that transmission can occur during the incubation period or asymptomatic COVID-19 carrier. Asymptomatic is a condition when someone is positive infected with the disease, but does not feel clinical symptoms.
Case in Germany.
Someone age 33 years (Patient 1) on January 24, 2020, complained :
- Sore throat.
- Shivering.
- Myalgia.
- The day after the fever 39,1°C.
- Cough.
On January 26, 2020, the patient felt that he had improved.
Contact History :
On January 20-21, 2020, the patient met with a business partner from China (a woman who was healthy and had no signs or symptoms of infection at the time). This woman then felt herself sick when the flight returned to China. On January 26, this woman was later tested positive for Covid-19. This news was then sent to the infectious and tropical diseases division, Munich to track and evaluate contact history.
Evaluation was performed on patient 1 :
Patient 1 was afebris and looked healthy.
There is no history of chronic disease.
There is no history of travel within 14 days before the onset of symptoms
Supporting investigation :
Nasopharyngeal swabs (2x) and Sputum ➡ positive Covid-19 in qRT-PCR.
On January 28, 2020, 3 employees at the company tested positive for Covid-19. One of these employees has a history of contact with Patient 1 and a woman from China, while the remaining 2 only have contact with Patient 1.
Conclusion : Transmission of Covid-19 infection occurs during virus incubation in the patient's body.
Case in China.
A family of 5 people, diagnosed pneumonia Covid-19 in Anyang, China.
Patient 1 (Suspect as an asymptomatic career) is a woman aged 20 years.
On January 10, 2020, patient 1 met patients 2 and 3.
- On January 13, 2020, patient 1 met with patient 2-patient 6.
- Patient 2-6 has no history of contact or travel to Wuhan other than patient 1.
- On January 23-26, 2020, patients 2-5 experienced symptoms of fever and respiration until they were treated and showed a positive RT-PCR result of Covid-19.
Patient 1 was then traced and showed positive results as well, but had no symptoms and the chest CT picture was within normal limits.
Conclusion :
In this case the incubation period for Covid-19 patients was 19 days, during which time the transmission occurred.
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