Hello reader! I was just getting the mail. After this, I have to go to work.
Attachment (Lock and Key)
Insertion (Insert viral DNA) and Replication of Viral DNA
The green dot in the air is the germ or pathogen about to be breathed in through his nose.
Assembling New Viruses
He is teaching his class about the lock and key theory, while ironically, the germs are finding their keyhole in his body.
Release (kills host cells)
After about 15 minutes into his science lecture, the germ is inserting it's DNA into the host cell it found in order for it to multiply.
The virus has won and made Tom sick.
Tom is nearing the end of his lecture and by that time, the virus in his body has started assembling more viruses. The students are bored and coughing all over the place spreading even more germs.
Tom has to end his lecture early because he feels sick, He scheduled a doctor's appointment to see if there was anything out of the ordinary.
Once Tom's doctor appointment was over, he called the school and asked for a few days off since he had caught a virus.
Looks like you have a virus! If you want, I can prescribe some medicines to help relieve the symptoms, but they won't get rid of the virus. All you can do is rest and make sure to hydrate.