Why was Jacob given streptomycin, not penicillin? a) Francisella tularensis produces β-lactamase. b) Antibiotics are unable to penetrate the capsule of Francisella tularensis. c) Francisella tularensis has flagella and can "outswim" the antibiotics. d) Francisella tularensis produces a neurotoxin to neutralize penicillin.