Two tests for coronavirus

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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.

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