According to the new labor law, if you are only a carrier, you must apply for a health certificate, but this is only an ideal rule. It is estimated that it will not be done at the local health and epidemic prevention station. Even if it is stipulated, the local authorities will not issue certificates for you, so there is nothing you can do. So it's better to avoid catering or handle food. It's okay to start your own business, but you can find healthy workers to work. Now, it seems that the state stipulates that employees are not allowed to do hepatitis B antibody testing, but privately, employers still do, and unqualified employees are still not hired.