After entry into the host through ingestion or skin wounds, B. anthracis multiply inside the tissues of animal or human host, spread in the lymphatic system and undergo rapid multiplication. This results in production of anthrax toxin inside the body and causes death of host within a few days or weeks.

Article Anthrax: A disease of biowarfare and public health importance

Bacillus anthracis, the bacteria that causes anthrax, would be one of the biological agents most likely to be used. Biological agents are germs that can sicken or kill people, livestock, or crops. Anthrax is one of the most likely agents to be used because:

• Anthrax spores are easily found in nature, can be produced in a lab, and can last for a long time in the environment.
• Anthrax makes a good weapon because it can be released quietly and without anyone knowing. The microscopic spores could be put into powders, sprays, food, and water. Because they are so small, you may not be able to see, smell, or taste them.
• Anthrax has been used as a weapon before. Anthrax has been used as a weapon around the world for nearly a century. In 2001, powdered anthrax spores were deliberately put into letters that were mailed through the U.S. postal system. Twenty-two people, including 12 mail handlers, got anthrax, and five of these 22 people died.
• An anthrax attack could take many forms. For example, it could be placed in letters and mailed, as was done in 2001, or it could be put into food or water. Anthrax also could be released into the air from a truck, building, or plane. This type of attack would mean the anthrax spores could easily be blown around by the wind or carried on people’s clothes, shoes, and other objects. It only takes a small amount of anthrax to infect a large number of people.
• If anthrax spores were released into the air, people could breathe them in and get sick with anthrax. Inhalation anthrax is the most serious form and can kill quickly if not treated immediately. If the attack were not detected by one of the monitoring systems in place in the United States, it might go unnoticed until doctors begin to see unusual patterns of illness among sick people showing up in emergency rooms.
• https://www.cdc.gov/anthrax/bioterrorism/threat.html

Please see the following RG link:

Article Anthrax: A disease of biowarfare and public health importance

The Centers for Disease Control and Prevention (CDC)Trusted Source suggests that anthrax is one of the most likely agents to be used in a biological attack. This is because it’s easy to disseminate (spread) and can cause widespread illness and death.

Here are some other reasons why anthrax makes an effective agent for a bioterrorist attack:

• It’s easily found in nature.
• It can be produced in a lab.
• It can last for a long time without stringent storage conditions.
• It’s been weaponized before.
• It can be easily released — in powder or spray form — without drawing too much attention.
• Anthrax spores are microscopic. They might not be noticeable by taste, smell, or sight.
• https://www.healthline.com/health/anthrax#dangers-of-anthrax

There are three forms of the disease:

Cutaneous form (skin infection)

Gastrointestinal form ( gastrointestinal infection)

Inhalation form (most severe form).

After entry into the host through ingestion or skin wounds, B. anthracis multiply inside the tissues of animal or human host, spread in the lymphatic system and undergo rapid multiplication. This results in production of anthrax toxin inside the body and causes death of host within a few days or weeks.

Article Anthrax: A disease of biowarfare and public health importance

It has history of being used in the letters as spores when postbox were used. It is a zoonotic disease 🦠 and can be used as biological weapon.

I agree with Dr. Manal Hadi Kanaan