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freelance; self-employed and hired to work for different companies on particular assignments.

obituaries; a notice of a death, especially in a newspaper, typically including a brief biography of the deceased person

Sports; an activity involving physical exertion and skill in which an individual or team competes against another or others for entertainment.

Resistance; the ability not to be affected by something, especially adversely.

Lab technicians are skilled workers that work with complex systems or perform highly technical mechanical or diagnostic tests in medical or scientific laboratories.

sample; a small part or quantity intended to show what the whole is like.

Carry; an act of carrying something from one place to another.

Stage; a point, period, or step in a process or development.

Inflammation; a localized physical condition in which part of the body becomes reddened, swollen, hot, and often painful, especially as a reaction to injury or infection.

A microscope is used to view very small organisms such as bacteria and viruses, which cannot be seen with the naked eye. The passage discusses trachoma, a disease caused by a virus smaller than bacteria, making a microscope the appropriate instrument for its study.

Organism; an individual animal, plant, or single-celled life form.

contagious; (of a disease) spread from one person or organism to another, typically by direct contact.

Hygiene; conditions or practices conducive to maintaining health and preventing disease, especially through cleanliness.

washing; the action of washing oneself or laundering clothes, bed linen, etc.

prescription; an instruction written by a medical practitioner that authorizes a patient to be issued with a medicine or treatment.