Invasion and multiplication of pathogenic microorganisms in the body is called an infection. When we are infected by pathogens we become sick, which means that our bodies stop functioning properly. Infectious agents, such as bacteria, a virus, fungi or protozoa cause communicable diseases.
verb (used with object), cc'ed or cc'd, cc'ing. 1. to send a duplicate of a document, email, or the like to: I always cc my boss when I write a memo to my staff. 2. to send (a duplicate of a document, email, or the like) to someone: Jim, please cc this to each of the department heads. Origin of cc.
What does QED mean? Q.E.D. stands for Quod Erat Demonstrandum, a Latin translation of the phrase $\ddot{o} \pi \varepsilon \rho \quad \ddot{\varepsilon} \delta \varepsilon \iota \quad \delta \varepsilon \hat{\iota} \xi \alpha \iota$ with which Euclid concluded most of his proofs. It means what was to be proved and signifies the proof has been concluded.