Allergies are the result of a hypersensitive immune system. The allergic immune system misidentifies an otherwise innocuous substance as harmful, and then attacks the substance with a ferocity far greater than required.
Laying off an employee is different from firing an employee. Firing means letting a worker go for any reason, whereas a layoff refers to an employment termination based on economics, usually involving more than one worker.
A layoff[1] is the temporary suspension or permanent termination of employment of an employee or, more commonly, a group of employees (collective layoff)[2] for business reasons, such as personnel management or downsizing an organization.