chapter 20 Flashcards
pathogen that can cause foodborne illnesses
certain bacteria
viruses
molds
worms
protozoa
what food is pathogens most commonly found in
foods from animal sources
what is food poisoning
general term for foodbornie illess
foodborn infection occurs when develops as result of pathgeon infecting someone
if toxins are prodcued by pathogen then its called food intoxiciation
enterotxins +neurotoxins
enterotoxins - affect mucous membranes in diestive tract
neurotoxins - afcect nervous system
1 in ___ amercaisn amy xperience food poisoning each year
6
symptoms of food poiosoning
vomiting
diarrhea
heache
abd cramps
symptoms like flu
campylobacter jejuni
one of most prevalent cuases of diarrhea
commonly found in intestinal tracts of cattle pigs sheep chickens turkeys dogs and cats and can contaminate meat during slaughter
caused by ingestion of live bacteria
take 2-5 days to develop after infection and may least up to 7 days
symptoms include diarrhea, fever, headache, muscle and abd pain, nausea
can be transmitted to humans via unpasturized milk, contaminated water, and raw or undercooked meats, poultry, and shellfish
May spread to bloodstream and cause a serious life-threatening infection
clostridium botulinum
found in soul and water on plants and in instestnial tracts of aminals and fish
spores of these bacterias can divide and produce toxin in the absence of oxygen (single cells that are produced asexually, each of which is able to develop into new organisms, have thick, protective walls that allow them to survive unfavorable condition)
toxin can be produced in sealed containers such as cans, jars, and vacuum-packaged foods
spores are extremely heat resistant and must be boiled for 6 hous before tney will be destroyed (and thus destroy the food)
home canned goods should be boiled for 10 min
botulism
rarest and most deadly of all food poisonings
18-36 hours after eating and include double vision, speech difficulties, inability to swallow, respiratory paralysis
fatal in 5-10% of cases
145 cases annyally
if can buldges C botulinum may be present and can be fatal
clostridium perfringens
cafeteria or buffet germ
infects those who eat food that has been standing on buffests or steam tables for long periods
found in soil, dust, sweage, and intestinal tracts of animals
spore-forming pathogen tht needs little oxygen
bacteria destroyed by cooking but spores can survive it
C. perfringens is transmitted by eating heavily contaminated foods
symptoms include nausea, diarrhea, and inflammation of stomach and intestines (6-24 hours of ingestion)
to best prevent, hot foods shoudl be kept at or avoe 140F and cold foods below 40F (leftovers should be heated to 165F before serving)
- foods should be stored at temp of 50F or lower
cryptosporidium
parasite that causes cryptosporidiosis in intestines of human and animals
can live outsde of body for long periods of time and commonly found in infected stoodls of animals or humans
commonly found in contaminated soil, food, and water and recrational water sources includng swimming pools, lakes, rivers, and hot tubes
most common symptoms of rypto is watery diarrhea, stomach cramps, fever, nausea, vomiting, and dehtdration
2-10 days after becoming infected w praasite and may last 1-2 weeks
practice good hygeine such as washing hands after going to the bathroom and handling raw meat
avoid contaminated water from wells, lakes, springs, and ponds
Escherichia coli
group of bacteria that can cause illness in humans
E.Coli 0157:H7 is higly infectious strain
bacteria found in intestine of small mammals, raw milk, water contamitned by animal or human feces
e.coli transmitted to humans thorugh contaminated water, unpastruerized milk r apply juice, raw or rare ground beef products, unwashed fruit or veg and directly from person-to-person
-70k cases of inection yrly
sympttoms of e.coli
severe abd cramps diarrhea that may be watery or bloody, and nausea
3-8 days of ingestions w most ppl recovering within 10 days
can canuse hemorrhagic colitis and then hemolytic uremic yndrome in children
e.coli can be controlled by careful choice and cooking foods (meats and poultry should be cooked, ground beef, veal, and lamb should be cooked to 160F and ground poultry to at least 165F) (wash fruit and veg, unpasturerized milk and other dairy products, and veg, and fruit juices)
listeria monocytogenes
bacterium often found in human and animal intestines and in milk, leafy veg, and soils
grow in refrierator and can be transited to hmans by unpastreurized dari yfoods such as milk, soft cheeses, and ince crease and vita raw leafy veg and rpocessed meats
symptoms include : fever, chills, headache, stiff neck, backache, upset stomach (sometimes), diarrhea - up to 3 weeks to become ill
pregnant women at risk
symtpoms of listeria monocytogenes
can affect a person from 12 hours to 8 days after ngeston
include fatigue, fever, chills, headaches, backache, and pain, and diarrhea
can develop into more seriosu condition and cause respiraorrt distress, spotaneous abortion or meningitis
prevent by throughly cooking meats and poultry and washign salad greens
shigella
found in intestinal tract and thus feces of infected individuals
causes shigellosis
passed by infected food handler who didnt practice proper handwashign after using the toilet
also found on plants fertiziled w untreated animal feces or contaminated water
commercially perpared mayo is not common culprit of foodborne illnesses in cold salads
shigella are desroyed by heat byt infected cold foods such as tuna chicken or egg salads are common carriers and should be kept on ice when servied
occurs from one day to one week fllowing infection
symptoms include diarrhea (w blood and mucus sometimes), fever, chills, eahdache, nausea, ad cramps and dehtdaration
cook to 145-16t5F to make safe for conusmptio n
staphylococcus arueos
found on human skin, in infected cuts and pimples and in noses and throats
staph poisoning commonly knowns as staph
bacteria grow in meats, poultry, fish, egg dishes, salads such as potato, egg, macaroni, and tuna, and cream filled pasitries
poisoning is transmitted by carriers and by eating foods that contain toxin these bacteria create
sypmtoms include vomiting, diarrhea, and abd crampingvs beginning within 30 min to 6 hours after ingestion of toxin and last from 24-72 hr
milkd illness
growth of bacterai is inhibited if foods are kept at. temp above 140F or below 40F
toxin destroyred by oiling food for several hours or by heating it in presure cooker at 240F for 30 min
both methods destoy nutrients and appeal of food so safely discard suspected contaminated foods
what is mold?
type of fungus
roots go down into food and grows stalk upwar on wich spores form
green fuzzy part that can be seen by naked eye is where spores are found
some spores cause respiratory problems and allergic reactions for some people
what is aflatoxin
mycotoxin that can cause cancer
develop in spolied peantus and peanut butter, soybeans, grains, nuts, and spices
symptoms of infection include abd pain, vomiting, and diarrhea, and may occur from 1 day to several months after ingestion
can cause liver and skin damange and ultiatmely cancer
cut cheese w mold at last 1 in
dont purhcase fruits and veg shoulindg mold
trichinella spiralis
parasitic worm that causes trichinosis
transmitted by eating inadequately cooked pork from pigs that are infected w T. spiralis parasites
wild game (esp bear) has been found to carry this parasite
symtpoms include abd pain, vomtigin fever chills and muscle pain
symtpoms occur abt 24 hours after ignested infected pork
due to increased regulation of feed and products given to pigs infection is less common
cook whole cuts of pork to internal temp of 145f, ground meat to 160F
dysentry
disease cause by protozoa (tiny, one-celled animals)
protozoa introduced to food by carriers or contaninminated water
cause severe diarrhea that can occur intermittently until client is treated
primary treatment for foodborne illnesses
replace lost fluids and electroyltes to prevent dehydration
clear liqiuids such as fruit juice, borth, sports drinks as toelrated
oral rehydration for older and weakened immune systems
balnd, easy to digest foods like potatoes, rice, toast, applesauce, and banana
chidlren = commerical oral rehydration
infants will needbreast milk or formulaa
anti-diarrheal med
loperamide and bismuth subsalicylate can help stop diarrhea in adults
for blood diarrhea, which is sign of vacterial or parasitic infections, shouldnt use these medications
children and infants usually are not prescribed these med
may need antibitioics
hospitalization may be needed to treat complications of foodborne illness such as severe dehydration, paraylsis or hemolytic uremic syndrome
how do most foodborne illness occurs
ignornace or carelessness of ppl who handled food
ppl introduce pathogens to food, prevent them from reaching it, or kill them w approparite cooking temp
improper cleaning of kitchen equipment
cross-contaimnation
non-infected subsequenlty prepared w this equipment can becoem infected by same pathogens
four easy ways to reduce foodborne illnesses
clean speerate cook and chill
clean to reduce foodborne illensses
wash hands often
wet hands w clean running water and apply soap
scrub alll parts of hands for 20 seconds
rinse througouhly under runnign water and dry hands w clean paper towel
seperate to reduce foodborne illensses
keep raw meats and ready-to-eat foods
seperate as you prepare and stor them
store raw fish, meat, and poultry on a shelf below ready-to-eat foods
use seperate cutting boards for raw meat, poultry, and seafood, and one for ready-to-eat foods (cold coded cutting boards)
cook to reduce foodborne illensses
cook to prper temp
fish, meat, poultry, and egg dishes shoudl be cooked to fecommendned safe minimum internal temp
food thermometer
chill to reduce foodborne illensses
refiridgerate leftowvers promptly to 40F or below
foods are no lnger safe to eat if they have been in danger zone of 40-140F for more than 2 hours (1 hour if temp is over 90FO
keep refrigerator at 40F or below and freezer at )F or below