Clostridial Infections in Cattle: A Comprehensive Review with Emphasis on Current Data Gaps in Brazil

Abstract

Clostridial infections in cattle are a significant concern for Brazilian livestock. These diseases are caused by various species of Clostridium, which are known for their ability to produce potent toxins. Botulism in cattle is a serious and often fatal condition caused by the ingestion of neurotoxins produced by C. botulinum. This bacterium thrives in decomposing organic matter, such as spoiled feed, carcasses, and contaminated water. Tetanus is less common, but it is a serious disease that follows the contamination of wounds with Clostridium tetani spores. It results in muscle stiffness, spasms, and often death due to respiratory failure. Blackleg (C. chauvoei) is a disease that primarily affects young cattle, leading to acute lameness, swelling, and high fever. Malignant edema (C. septicum and others) is characterized by rapid onset of swelling at wound sites, and it can occur after injuries or surgical procedures. Enterotoxemia is triggered by the rapid growth of C. perfringens in the gut following excessive carbohydrate intake. This leads to toxin production that causes sudden death. In conclusion, clostridial bovine infections remain a persistent challenge for Brazilian cattle farmers. With continued focus on vaccination, good management practices, and research, the impact of these diseases can be minimized, safeguarding the livestock industry's economic viability.

Keywords: blackleg; botulism; enterotoxemia; malignant edema; tetanus.

Figure 1

Pathogenesis of botulism [6].

Figure 2

Clostridial diseases. Botulism. Flaccid paralysis in a cow. The lack of tonus in the muscle limbs (flaccidity) prevents the steer from standing [6].

Figure 3

Pathogenesis of tetanus [6].

Figure 4

Clostridial diseases. Tetanus. Steer with opisthotonus [6].

Figure 5

Schematic illustration of blackleg pathogenesis with currently considered major virulence factors [33].

Figure 6

Gas gangrene is caused by Clostridium septicum in a heifer. (1) Severe subcutaneous hemorrhage and edema. (2) Severe subcutaneous edema expanding the subcutis [36]. Reprinted with permission from Ref. [36].

Figure 7

Focal symmetrical encephalomalacia. This animal developed progressive neurologic signs that became severe 8 days after inoculation, at which time the calf was euthanatized [49]. Reprinted with permission from Ref. [49].