Group 06
Makofane L 230546142
Kubheka TN 231337695
Monokoane D 230085935
Mhlanga SAP 230550255
Mohlaba 223755097
Ndlovu ZP 219831978
Sibeko NF 223928099
Introduction
• Bacillus cereus is a gram positive rod-shaped bactrerium commonly
found in soil, food and marine sponges.
• The specific name cereus, meaning ''waxy'' in Latin referes to the
appearance of colonies grown on blood agar
• Some strains are harmful to human which cause foodborne illness due
to their spore-forming nature while other strains can be beneficial as
probiotics for animals, and even exhibit mutualism with certain plants.
• B. cereus bacteria may be anaerobes or facultative anaerobes and
other members of genus Bacillus , can produce protective endospores.
Morphology of bacillus
cereus
1. Shape and size:
• B. cereus cells are rod-shaped (bacilli) , about 0.51.0 micrometers wide and 2-3 micrometers long
• They are Gram-positive, meaning that they have a
thick cell wall that retains a violet stain during gram
staining
2. motility:
• Single polar flagellum that allows them to move
3. Spore formation:
• They can form endospores that are resistant
to many environmental conditions
This Photo by Unknown author is licensed under CC BY-SA-NC.
B. CEREUS: DISEASE
AND SYMPTOMS
Bacillus Cereus is a type of bacteria that
can cause food poisoning and wound
infection
1.
B. Cereus Food poisoning :
• Symptoms: Nausea, vomiting,
abdominal pain, Diarrhea and fever
• Treatment : Hydration, rest, antibiotics
2. B. Cereus Wound Infection :
• Symptoms : Redness, swelling, pain.
• Prevention: keeping wounds clean and
covered, washing hands
• Treatment : Antibiotics, draining of
pus, depridement ( removal of dead
tissue)
Mode of transmission of B.Cereus
B. cereus is primarily transmitted through
food, but it can also transmitted through
wounds
- Food: undercooked riced, undercooked
meat improperly refrigerated food.
- Wounds: Contaminated surfaces, animal
bites, and insects
• Transmission occurs when contaminated
food or surfaces come into contact with
person's mouth or an open wound. Once
inside the body, B.Cereus can multiply
cause infection
This Photo by Unknown author is licensed under CC BY.
Preventative/Control methods of diseases cause
B.Cereus
There are several preventative and control methods that can be used to
reduce the risk of B.Cereus infection.
• These include:
- Proper food handling and preparation: Proper cleaning , storage and
cooking of food can help prevent the growth of B.cereus.
- PPE: Proper personal protective equipment, such as gloves and hairnets,
can help reduce the risk of contamination
- Prompt treatment: If a person has symptoms of B.cereus
Interesting Facts about
B.cereus organisms
• B.cereus is a spore-forming bacteria.
- This means that it can form spores, which are hardy
in structures that allow the bacteria to survive in
harsh conditions
- The spores of B. cereus can survive for years,
making them a difficult contaminant to get rid of.
- B. cereus is heat-resistant, and the spores can
survive temperatures up to 121 °C
This Photo by Unknown author is licensed under CC BY-NC-ND.
- B. cereus is found all over the world, in many
different environments, including soil, dust, and
water