As an individual you should have a realistic fear of contracting any infectious disease but as a species it will take far more than an infection to eradicate the human race. Simply put, a disease may kill many but it won't kill everyone.
If the agent is effective enough, or militarized, it can be resistant to medication, spread fast and kill within days of infection.
Governments have worked to fund military research to create drug resistant strains of deadly infectious agents. Nature by way of evolution also creates its own drug resistant strains of infectious agents but at a pace that is more reasonable and a pace that allows us to keep up with the adaptations.
I've summed up the Wikipedia description of TB:
Tuberculosis (abbreviated as TB for Tubercle Bacillus) is a common and deadly infectious disease that is caused by mycobacteria. TB kills more than half of its victims. Worldwide, TB infections occur at a rate of one per second. Not everyone who is infected develops the disease. Symptoms include a productive, prolonged cough of more than three weeks duration, chest pain and coughing up blood. Systemic symptoms include fever, chills, night sweats, appetite loss, weight loss and paling, and those afflicted are often easily fatigued.
Fear not the deadly infections that are everywhere around you. Fear not the misguided actions of "elected" leadership. Have no fear in the world because the world is not out to get you.
Do take action to reduce your risk. Wash your hands. Practice safer sex. Avoid people wearing medical masks.
Live your life and do your best to a productive member of the human species.