challenge
a call to fight, as a battle, a duel,etc.
effort
something done by exertion or hard work I thought it would be easy but it was an effort
focus
close attention or concentration.
mindset
a fixed attitude, disposition, or mood.
perseverance
steady persistence in a course of action, a purpose, a state, etc., especially in spite of difficulties, obstacles, or discouragement.
strategy
skillful use of a stratagem.
The salesperson’s strategy was to seem always to agree with the customer.
virus
a disease caused by a virus
gravity
the force of attraction by which terrestrial bodies tend to fall toward the center of the earth.
disease
obsolete lack of ease trouble
infect
to transmit a pathogen or disease
avoid
to stay clear of going around a pothole
mystery
a mystery play
rare
thin in density rarefied rare air
invaders
a lot of invaders pillage a village
cover
to travel or pass over
examine
to observe carefully
obvious
easily perceived
antibodies
when bacteria enter a flesh wound
contain
to hold or keep within limits
protect
to keep from being damaged
immunize
to render immune
epidemiologist
The branch of medicine that deals with the study of the causes, distribution, and control of disease in populations
immune system
The integrated body system of organs, tissues, cells, and cell products such as antibodies that differentiates self from nonself and neutralizes potentially pathogenic organisms, agents, or substances, consisting in vertebrates of the adaptive and the innate immune systems.
vaccine
Computers A software program designed to detect and stop the progress of computer viruses.