Two tests for coronavirus
- A plain-coloured coronavirus swims in a system- Close-up of a woman manipulating sample tube- Cut to a close-up of a man sneezing into his elbow- Pan along a gene sequence, multi-coloured- Close-up, health worker removes a swab, cut to the swab being placed in a patient's nose cavity.- Laboratory scenes, swab analysis.- Genome is seen.- Cut to a close-up of a sample tube, bubble showing genome.- Virus swimming in a system- Close-up of a health worker taking a blood sample from a human arm.- Blood sample tube, close-up, virus floats in the background, coloured.- Cut to a microscope, then antibodies, blue, then orange. Then the virus next to them.- IgG antibody appears, virus blows away.- Pan down, a patient is shown in bed, sleeping, but recovering, smiles.
AFP TEXTSeptember 19, 2020
Large parts of Europe on Friday geared up for broad new restrictions to stop the coronavirus, after infections worldwide topped 30 million and the World Health Organization warned of "alarming rates of transmission".
Britain is limiting gatherings and France is set to roll out new curbs for major cities as governments across the continent battle fresh spikes of the disease.
More than 943,000 people have now died from Covid-19 since it first emerged in China late last year, according to an AFP tally, with Europe accounting for more than 200,000.
WHO regional director for Europe Hans Kluge said a surge seen this month "should serve as a wake-up call" after the continent recorded 54,000 infections in a single day last week -- a new record.
"Although the numbers reflect more comprehensive testing, it also shows alarming rates of transmission across the region," Kluge told an online news conference from Copenhagen.
SCRIPTTwo tests for coronavirus
There are two main types of test to detect the presence of coronavirus.
If a patient is infected, a molecular test is carried out. This looks for genetic sequences specific to SARS-CoV-2.
A swab sample is taken from the nose, the back of the throat, or from a patient's sputum.
In a specially designed laboratory, a gene analysis is carried out using a technique which amplifies parts of the genome.
The result is positive if two specific SARS CoV-2 genes are detected. A result is possible in a few hours.
To check whether an individual has been infected by Sars Cov-2 in the recent past, a serological test is carried out.
A blood sample is taken to search for antibodies produced by the immune system to fight the virus, whether a person is sick or not.
Technicians look for two main antibodies: IgM, produced at the start of an infection, and IgG antibodies, which appear later. If both are present, the patient is infected.
If only IgG is present, it means the patient is recovering, or has fully recovered and that he or she has acquired immunity, although it is not known for how long.
The results of these tests are available in just a few minutes.