Which of the following are true of Mycobacterium leprae and Mycobacterium lepromatosis?
1) High G C non-endospore-forming, Gram-positive bacilli
2) May remain alive inside infected cells for 10 to more than 30 years with no obvious sign or symptoms in a patient
3) Cause severe muscle contraction by a potent neurotoxin called tetanospasmin
4) Are the only known bacterial pathogens of peripheral nerves
5) Have cell walls containing a large amount of mycolic acid which accounts for the slow growth rate of the bacterium and protects it from lysis once phagocytized