**Question:** All of the following are true about bacillus anthrax except:

A. It is a Gram-positive bacillus.
B. It produces anthrax toxin.
C. It is commonly found in soil.
D. It is always associated with the consumption of contaminated meat.

**Core Concept:** Bacillus anthracis is a spore-forming, Gram-positive bacterium responsible for anthrax, an infectious disease. Anthrax toxin is produced by the bacterium, which is a major factor in the disease pathogenesis. The bacterium is commonly found in soil contaminated by dead animals, such as woolly mammoths and horses, which have died from anthrax infection. Ingestion or inhalation of spores can lead to anthrax infection in humans and animals.

**Why the Correct Answer is Right:** Option D is incorrect because not all cases of anthrax are associated with the consumption of contaminated meat. In fact, cutaneous anthrax occurs when the spores enter the body through cuts or scratches on the skin, leading to local infection. Inhalational anthrax occurs when spores are inhaled, leading to pneumonia and systemic infection. Ingestion of contaminated meat is a route of transmission but is not the sole mode of infection.

**Why Each Wrong Option is Incorrect:**

A. While anthrax is a Gram-positive bacterium, the statement "It is always associated with consumption of contaminated meat" is incorrect, as other modes of transmission, like cutaneous and inhalational anthrax, exist.

B. Producing anthrax toxin is indeed a key feature of Bacillus anthracis, contributing to the disease pathogenesis.

C. Anthrax spores are commonly found in contaminated soil, resulting in cutaneous anthrax and inhalational anthrax in humans and animals.

**Clinical Pearl:** Anthrax is a notifiable disease and must be reported to public health authorities. Early diagnosis and treatment can prevent severe complications and mortality. Prompt administration of antibiotics, such as ciprofloxacin or doxycycline, can halt the progression of the infection and reduce morbidity and mortality.