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.
When an employer discharges or lays off an employee, the employer must pay the employee all wages due on the day of the discharge, except in Boston where they must be paid as soon as the employer has complied with the laws requiring pay rolls, bills and accounts to be certified. Massachusetts Gen. Law 149:148.