৪৯তম বিসিএস ⎯ গার্হস্থ্য অর্থনীতি [৩৯১]

Microbial/Biological: Caused by harmful microorganisms like bacteria, viruses, parasites, and fungi.
Examples: Salmonella, E. coli, and Listeria are common bacteria that can contaminate meat, poultry, and dairy products. Viruses like Norovirus and Hepatitis A can also be spread through infected food handlers.

Scombroid Poisoning
• Scombroid poisoning is a unique type of foodborne illness caused not by a living organism, but by histamine and other toxins that build up in fish after improper handling. It's often mistaken for a seafood allergy because the symptoms are so similar.
• Common Sources: Oily fish like tuna, mackerel, mahi-mahi, and bonito that have not been properly refrigerated after being caught. Bacteria on the fish convert a natural amino acid (histidine) into histamine, which is not destroyed by cooking, freezing, or canning.
• Typical Symptoms: Flushing of the face, sweating, headache, tingling or burning sensations around the mouth, rash, and a metallic or peppery taste in the mouth. Diarrhea, nausea, and vomiting can also occur.
• Onset Time: Symptoms can appear very quickly, usually within 10 to 60 minutes after eating the contaminated fish.

Cyclospora (Cyclosporiasis)
• Common Sources: Often associated with imported fresh produce, such as raspberries, basil, lettuce, and snow peas.
• Typical Symptoms: Watery diarrhea, loss of appetite, significant weight loss, cramping, and bloating.
• Onset Time: Symptoms can take up to 1 week to appear.

Yersinia (Yersiniosis)
Yersinia is a bacterium that causes yersiniosis. The illness is most common in young children and can often be confused with appendicitis.
Common Sources: Primarily linked to eating raw or undercooked pork, especially raw pork intestines (chitterlings). Contaminated unpasteurized milk or water can also be sources.
Typical Symptoms: Fever, stomach pain, and diarrhea (which can be bloody). In older children and adults, the pain is often on the lower right side of the abdomen, mimicking the symptoms of appendicitis.
Onset Time: Symptoms generally start 4 to 7 days after infection.

Salmonella (Salmonellosis)
Salmonella is a type of bacteria that causes salmonellosis, one of the most common bacterial foodborne illnesses. It is frequently found in raw or undercooked poultry, eggs, ground beef, and sometimes produce. Symptoms include fever, diarrhea, and abdominal cramps. Most people recover without specific treatment, but the illness can be serious for infants, the elderly, and those with weakened immune systems. The onset of symptoms is typically within 6 hours to 6 days after exposure.

 Yeast
Single-celled microorganisms.
Grow in sweets, pickles, syrups, jams, jellies in the presence of moisture and air.
Use carbohydrates for growth.
Convert sugars into alcohol + CO₂ → food becomes bubbly and smells bad.
Cannot survive in very high temperature or dry conditions.
Optimum growth: 20–30°C with moisture.

Vibrio (Vibriosis)
• Vibrio bacteria live naturally in warm, coastal saltwater and brackish water. Infections from this bacteria are called vibriosis and are on the rise due to warming ocean temperatures.
• Common Sources: Eating raw or undercooked shellfish, particularly oysters. It can also be spread to people with open wounds that are exposed to contaminated seawater.
• Typical Symptoms: The most common symptoms are watery diarrhea, stomach cramps, nausea, and fever. In severe cases, particularly with the species Vibrio vulnificus, it can cause life-threatening bloodstream infections and blistering skin lesions.
• Onset Time: Symptoms usually appear within 12 to 24 hours after eating contaminated food.

 Yeast
Single-celled microorganisms.
Grow in sweets, pickles, syrups, jams, jellies in the presence of moisture and air.
Use carbohydrates for growth.
Convert sugars into alcohol + CO₂ → food becomes bubbly and smells bad.
Cannot survive in very high temperature or dry conditions.
Optimum growth: 20–30°C with moisture.

Microbial/Biological: Caused by harmful microorganisms like bacteria, viruses, parasites, and fungi. Examples: Salmonella, E. coli, and Listeria are common bacteria that can contaminate meat, poultry, and dairy products. Viruses like Norovirus and Hepatitis A can also be spread through infected food handlers.

Listeria (Listeriosis)
•    Listeria monocytogenes is a bacterium that causes listeriosis, a serious and sometimes fatal illness. Unlike many other foodborne pathogens, it can grow in refrigerated temperatures. Common sources include ready-to-eat deli meats, soft cheeses, unpasteurized milk, and hot dogs. Symptoms can range from flu-like illness with fever and muscle aches to severe neurological symptoms like headaches and a stiff neck. Listeriosis is especially dangerous for pregnant women, newborns, and the elderly, and the onset time can vary widely, from a few days to several weeks.

Toxoplasma gondii (Toxoplasmosis)
• Toxoplasma gondii is a parasitic protozoan that causes toxoplasmosis. While most healthy people have no symptoms, it can be extremely dangerous for pregnant women and individuals with weakened immune systems.
• Common Sources: Eating undercooked meat (especially pork, lamb, and venison) or unwashed produce. It can also be spread through contact with infected cat feces.
• Typical Symptoms: Most people are asymptomatic. For those who do get sick, symptoms are often mild and flu-like, including muscle aches, swollen lymph nodes, and fever. In severe cases in immunocompromised individuals, it can cause damage to the brain, eyes, or other organs.
• Onset Time: The incubation period can vary widely, from a few days to several weeks.

Cholera (Vibrio cholerae)
Source: Found in fish and shellfish contaminated by fecal matter in water.
Symptoms: Symptoms appear 1–3 days after ingestion, primarily causing severe watery diarrhea and dehydration, which can be fatal if untreated.
Prevention:
Maintain food hygiene.
Clean and cook seafood thoroughly.

Chemical: Occurs when food comes into contact with chemicals, which can be natural or artificial. Examples: Pesticides and fertilizers can contaminate produce, while cleaning products can accidentally get into food during preparation. Certain toxic metals can also contaminate food through improper cookware

Cryptosporidium (Cryptosporidiosis)
•    Common Sources: Primarily contaminated water (both drinking and recreational), uncooked food, or contact with feces.
•    Typical Symptoms: Watery diarrhea, stomach cramps, and dehydration.
•    Onset Time: The illness typically begins 2 to 10 days after exposure.

Viruses like Norovirus and Hepatitis A spread mainly through infected food handlers who touch food without proper hygiene.

Chemical: Occurs when food comes into contact with chemicals, which can be natural or artificial. Examples: Pesticides and fertilizers can contaminate produce, while cleaning products can accidentally get into food during preparation. Certain toxic metals can also contaminate food through improper cookware

Norovirus
•    Norovirus is a highly contagious virus that is the leading cause of foodborne illness in the United States. It's often spread through an infected food handler, contaminated water, or shellfish. It is known for causing sudden onset of severe vomiting, watery diarrhea, nausea, and stomach cramps. The illness is sometimes called the "stomach flu," though it is not related to influenza. Symptoms usually appear very quickly, within 12 to 48 hours after exposure.

•    Listeria (Listeriosis)
•    Listeria monocytogenes is a bacterium that causes listeriosis, a serious and sometimes fatal illness. Unlike many other foodborne pathogens, it can grow in refrigerated temperatures. Common sources include ready-to-eat deli meats, soft cheeses, unpasteurized milk, and hot dogs. Symptoms can range from flu-like illness with fever and muscle aches to severe neurological symptoms like headaches and a stiff neck. Listeriosis is especially dangerous for pregnant women, newborns, and the elderly, and the onset time can vary widely, from a few days to several weeks.

Physical: The presence of foreign objects in food that can cause injury, choking, or illness.
Examples: Common physical contaminants include hair, glass, plastic, metal shards, and pests.
Allergenic: This type of contamination happens when food allergens are unintentionally transferred to a food product.
Examples: Cross-contamination can occur if the same utensils are used for a peanut-containing dish and a peanut-free one, which can be life-threatening for individuals with severe allergies.

Yersinia (Yersiniosis)
•    Yersinia is a bacterium that causes yersiniosis. The illness is most common in young children and can often be confused with appendicitis.
•    Common Sources: Primarily linked to eating raw or undercooked pork, especially raw pork intestines (chitterlings). Contaminated unpasteurized milk or water can also be sources.
•    Typical Symptoms: Fever, stomach pain, and diarrhea (which can be bloody). In older children and adults, the pain is often on the lower right side of the abdomen, mimicking the symptoms of appendicitis.
•    Onset Time: Symptoms generally start 4 to 7 days after infection.

Yersinia (Yersiniosis)
•    Yersinia is a bacterium that causes yersiniosis. The illness is most common in young children and can often be confused with appendicitis.
•    Common Sources: Primarily linked to eating raw or undercooked pork, especially raw pork intestines (chitterlings). Contaminated unpasteurized milk or water can also be sources.
•    Typical Symptoms: Fever, stomach pain, and diarrhea (which can be bloody). In older children and adults, the pain is often on the lower right side of the abdomen, mimicking the symptoms of appendicitis.
•    Onset Time: Symptoms generally start 4 to 7 days after infection.

Physical: The presence of foreign objects in food that can cause injury, choking, or illness.
Examples: Common physical contaminants include hair, glass, plastic, metal shards, and pests.
Allergenic: This type of contamination happens when food allergens are unintentionally transferred to a food product.
Examples: Cross-contamination can occur if the same utensils are used for a peanut-containing dish and a peanut-free one, which can be life-threatening for individuals with severe allergies.

E. coli O157:H7
•    Common Sources: Undercooked ground beef, raw milk, fresh produce (like spinach and lettuce), and contaminated water.
•    Typical Symptoms: Severe stomach cramps, diarrhea (often bloody), and vomiting.
•    Note: This particular strain can lead to a serious complication called Hemolytic Uremic Syndrome (HUS), which can cause kidney failure.

Physical: The presence of foreign objects in food that can cause injury, choking, or illness.
Examples: Common physical contaminants include hair, glass, plastic, metal shards, and pests.
Allergenic: This type of contamination happens when food allergens are unintentionally transferred to a food product.
Examples: Cross-contamination can occur if the same utensils are used for a peanut-containing dish and a peanut-free one, which can be life-threatening for individuals with severe allergies.

 Toxoplasma gondii (Toxoplasmosis)
• Toxoplasma gondii is a parasitic protozoan that causes toxoplasmosis. While most healthy people have no symptoms, it can be extremely dangerous for pregnant women and individuals with weakened immune systems.
• Common Sources: Eating undercooked meat (especially pork, lamb, and venison) or unwashed produce. It can also be spread through contact with infected cat feces.
• Typical Symptoms: Most people are asymptomatic. For those who do get sick, symptoms are often mild and flu-like, including muscle aches, swollen lymph nodes, and fever. In severe cases in immunocompromised individuals, it can cause damage to the brain, eyes, or other organs.
• Onset Time: The incubation period can vary widely, from a few days to several weeks.

Cyclospora (Cyclosporiasis)
• Common Sources: Often associated with imported fresh produce, such as raspberries, basil, lettuce, and snow peas.
• Typical Symptoms: Watery diarrhea, loss of appetite, significant weight loss, cramping, and bloating.
• Onset Time: Symptoms can take up to 1 week to appear.

    Norovirus
•    Norovirus is a highly contagious virus that is the leading cause of foodborne illness in the United States. It's often spread through an infected food handler, contaminated water, or shellfish. It is known for causing sudden onset of severe vomiting, watery diarrhea, nausea, and stomach cramps. The illness is sometimes called the "stomach flu," though it is not related to influenza. Symptoms usually appear very quickly, within 12 to 48 hours after exposure.

Cryptosporidium (Cryptosporidiosis)
• Common Sources: Primarily contaminated water (both drinking and recreational), uncooked food, or contact with feces.
• Typical Symptoms: Watery diarrhea, stomach cramps, and dehydration.
• Onset Time: The illness typically begins 2 to 10 days after exposure.

• Toxoplasma gondii (Toxoplasmosis)
• Toxoplasma gondii is a parasitic protozoan that causes toxoplasmosis. While most healthy people have no symptoms, it can be extremely dangerous for pregnant women and individuals with weakened immune systems.
• Common Sources: Eating undercooked meat (especially pork, lamb, and venison) or unwashed produce. It can also be spread through contact with infected cat feces.
• Typical Symptoms: Most people are asymptomatic. For those who do get sick, symptoms are often mild and flu-like, including muscle aches, swollen lymph nodes, and fever. In severe cases in immunocompromised individuals, it can cause damage to the brain, eyes, or other organs.
• Onset Time: The incubation period can vary widely, from a few days to several weeks

Cyclospora (Cyclosporiasis)

Common Sources: Often associated with imported fresh produce, such as raspberries, basil, lettuce, and snow peas.
Typical Symptoms: Watery diarrhea, loss of appetite, significant weight loss, cramping, and bloating.
Onset Time: Symptoms can take up to 1 week to appear.

Bacteria are the most common cause of foodborne illness. They can contaminate food through various sources, including soil, water, and animal or human feces.

Cryptosporidium (Cryptosporidiosis)
• Common Sources: Primarily contaminated water (both drinking and recreational), uncooked food, or contact with feces.
• Typical Symptoms: Watery diarrhea, stomach cramps, and dehydration.
• Onset Time: The illness typically begins 2 to 10 days after exposure.

Tenesmus is the specific medical term for the cramping pain and feeling of needing to pass stool when the rectum is empty.
Shigella (Shigellosis)
• Shigella is a highly infectious bacterium that causes shigellosis, a severe form of diarrhea. It spreads easily from person to person and through contaminated food or water.
• Common Sources: Foods and water contaminated with human feces from an infected person, often by a food handler with poor hygiene. Contaminated produce is a common source.
• Typical Symptoms: Watery or bloody diarrhea, fever, stomach pain, and a feeling of needing to pass stool even when the bowels are empty (tenesmus).
• Onset Time: Symptoms typically begin 1 to 2 days after ingesting the bacteria.

E. coli O157:H7
• Common Sources: Undercooked ground beef, raw milk, fresh produce (like spinach and lettuce), and contaminated water.
• Typical Symptoms: Severe stomach cramps, diarrhea (often bloody), and vomiting.
• Note: This particular strain can lead to a serious complication called Hemolytic Uremic Syndrome (HUS), which can cause kidney failure.

Clostridium perfringens: Often called the "cafeteria germ," this bacteria can grow in large batches of food, such as meats and gravies, that are left at unsafe temperatures for too long. It causes diarrhea and stomach cramps, but usually no fever or vomiting.

Clostridium botulinum: This bacteria produces a neurotoxin that causes botulism, a rare but life-threatening illness. It is typically associated with improperly canned or fermented foods. Symptoms include difficulty swallowing, muscle weakness, blurred vision, and paralysis.

Vibrio (Vibriosis)
• Vibrio bacteria live naturally in warm, coastal saltwater and brackish water. Infections from this bacteria are called vibriosis and are on the rise due to warming ocean temperatures.
• Common Sources: Eating raw or undercooked shellfish, particularly oysters. It can also be spread to people with open wounds that are exposed to contaminated seawater.
• Typical Symptoms: The most common symptoms are watery diarrhea, stomach cramps, nausea, and fever. In severe cases, particularly with the species Vibrio vulnificus, it can cause life-threatening bloodstream infections and blistering skin lesions.
• Onset Time: Symptoms usually appear within 12 to 24 hours after eating contaminated food.

Norovirus: The most common cause of foodborne illness in the U.S. and is often spread in settings like cruise ships, schools, and care homes. It causes sudden onset of vomiting, diarrhea, stomach pain, and nausea.

Hepatitis A: This virus causes a liver infection. Contamination often occurs when an infected food handler prepares food without proper handwashing. Sources include contaminated water, shellfish, and salads. Symptoms can include fever, fatigue, nausea, and jaundice (yellowing of the skin).

•  Giardia (Giardiasis)
•  Giardia is a microscopic parasite that causes giardiasis, an intestinal infection. It's often found in contaminated water sources like streams, lakes, and even some municipal water supplies. People can also get it from uncooked food or by coming into contact with feces from an infected person or animal. Symptoms typically include watery diarrhea, gas, stomach cramps, and nausea, and they can last for several weeks. The onset of illness is usually 1 to 2 weeks after exposure.

Physical: The presence of foreign objects in food that can cause injury, choking, or illness.
Examples: Common physical contaminants include hair, glass, plastic, metal shards, and pests.
Allergenic: This type of contamination happens when food allergens are unintentionally transferred to a food product.
Examples: Cross-contamination can occur if the same utensils are used for a peanut-containing dish and a peanut-free one, which can be life-threatening for individuals with severe allergies.

Mycotoxins: Produced by molds that grow on grains and other foods, these toxins can cause long-term health problems, including cancer.

• Salmonella (Salmonellosis)
• Salmonella is a type of bacteria that causes salmonellosis, one of the most common bacterial foodborne illnesses. It is frequently found in raw or undercooked poultry, eggs, ground beef, and sometimes produce. Symptoms include fever, diarrhea, and abdominal cramps. Most people recover without specific treatment, but the illness can be serious for infants, the elderly, and those with weakened immune systems. The onset of symptoms is typically within 6 hours to 6 days after exposure.

Prions: These are unique infectious proteins that can cause neurodegenerative diseases. The most well-known example is Bovine Spongiform Encephalopathy (BSE), or "mad cow disease," which can be transmitted to humans through contaminated beef products.

Campylobacter (Campylobacteriosis)
• Common Sources: Raw or undercooked poultry, unpasteurized milk, and contaminated water.
• Typical Symptoms: Diarrhea (often bloody), stomach cramps, fever, and vomiting.
• Onset Time: Symptoms usually appear 2 to 5 days after exposure.

Entero Viruses, Rota Viruses, Parvo Viruses

Source: These viruses enter the human intestine and spread via feces. Contamination occurs:
i) Using human feces as fertilizer in farms.
ii) Direct contamination from hands during food preparation.
iii) Contaminated water used in food or aquaculture.

Symptoms: Symptoms appear 24 hours after ingestion. Include severe diarrhea, nausea, and vomiting. Can last 4–7 days.

Prevention:

• Maintain hygiene when handling food.
• Proper sanitation and waste disposal.
• Use clean water for cooking and aquaculture.

Cholera (Vibrio cholerae)
Source: Found in fish and shellfish contaminated by fecal matter in water.
Symptoms: Symptoms appear 1–3 days after ingestion, primarily causing severe watery diarrhea and dehydration, which can be fatal if untreated.
Prevention:
Maintain food hygiene.
Clean and cook seafood thoroughly.

Cholera (Vibrio cholerae)
Source: Found in fish and shellfish contaminated by fecal matter in water.
Symptoms: Symptoms appear 1–3 days after ingestion, primarily causing severe watery diarrhea and dehydration, which can be fatal if untreated.
Prevention:
Maintain food hygiene.
Clean and cook seafood thoroughly.

• Giardia (Giardiasis)
• Giardia is a microscopic parasite that causes giardiasis, an intestinal infection. It's often found in contaminated water sources like streams, lakes, and even some municipal water supplies. People can also get it from uncooked food or by coming into contact with feces from an infected person or animal. Symptoms typically include watery diarrhea, gas, stomach cramps, and nausea, and they can last for several weeks. The onset of illness is usually 1 to 2 weeks after exposure.

Entero Viruses, Rota Viruses, Parvo Viruses

Source: These viruses enter the human intestine and spread via feces. Contamination occurs:
i) Using human feces as fertilizer in farms.
ii) Direct contamination from hands during food preparation.
iii) Contaminated water used in food or aquaculture.

Symptoms: Symptoms appear 24 hours after ingestion. Include severe diarrhea, nausea, and vomiting. Can last 4–7 days.

Prevention:

• Maintain hygiene when handling food.
• Proper sanitation and waste disposal.
• Use clean water for cooking and aquaculture.