All of the following are true about diphtheria except:
Faucial diphtheria is more dangerous than laryngeal diptheria
Laryngeal diphtheria mandates tracheostomy
Child is infectious with faucial diphtheria
Myocarditis may be a complication
Diphtheria:

Causative agent – Corynebacterium diphtheriae (Gram +ve bacillus)
Incubation period: 2 - 6 days.
Depending on site present as:

– Nasal diphtheria - Mildest, toxemia is minimal.
– Faucial diphtheria (most common) = Nasopharyngeal diphtheria - More severe than nasal diphtheria.
– Laryngotracheal diphtheria - Most severe, maximum obstructive symptom, tracheostomy may be essential.

Complications :

– Myocarditis - Occurs towards the end of 1st or begining of 2nd week.
– Peripheral neuropathy of descending type.
– Renal failure.
Remember : Cardiac damage is permanent, while recovery of nerve damage is rule.