<prompt> True about tetanus are all EXCEPT?Tetanus bacilli cannot spread through bloodSpread along the nervesRequires oxygenIncubation period is variable  <response>: Option a True Tetanus bacillus is not an invasive organism Option b True Tetanus toxin binds at neuromuscular junction enters motor nerve by endocytosis, after which it undergoes retrograde axonal transpo to cytoplasm of neuron Option c False Clostridium tetani, is a motile, Gram-positive, spore-forming obligate anaerobe Option d True The incubation period of tetanus is typically is 2-14 days but may be as long as months after the injury. 