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Food safety knowledge and practices of street food- vendors in Atbara City (Naher Elneel State Sudan)

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The study was conducted to evaluate the food safety knowledge and practices of street food vendors in Atbara city between March and April, 2008. The questionnaires respondents were 28% male and 72% were female, 48% of them had primary school education while 42% were illiterates. The most prevalent isolated bacteria from cooked meals, bottled drink and fresh juice were; Escherichia coli, Staphylococcus auerus and Bacillus sp. The viable bacterial counts were 4.6 CFU/ml, 3.7 CFU/ml and 4.1 CFU/ml for cooked meals, bottled drink and juice, respectively.
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African Journal of Biotechnology Vol. 8 (24), pp. 6967-6971, 15 December, 2009
Available online at http://www.academicjournals.org/AJB
ISSN 1684–5315 © 2009 Academic Journals
Full Length Research Paper
Food safety knowledge and practices of street food-
vendors in Atbara City (Naher Elneel State Sudan)
M. A. Abdalla, S. E. Suliman and A. O. Bakhiet*
College of Veterinary Medicine and Animal Production, Sudan University of Science and Technology P.O. Box 204,
Khartoum North, Sudan.
Accepted 22 September, 2009
The study was conducted to evaluate the food safety knowledge and practices of street food vendors in
Atbara city between March and April, 2008. The questionnaires respondents were 28% male and 72%
were female, 48% of them had primary school education while 42% were illiterates. The most prevalent
isolated bacteria from cooked meals, bottled drink and fresh juice were; Escherichia coli,
Staphylococcus auerus and Bacillus sp. The viable bacterial counts were 4.6 CFU/ml, 3.7 CFU/ml and
4.1 CFU/ml for cooked meals, bottled drink and juice, respectively.
Key words: Street, food, vendors.
INTRODUCTION
The term "street food" refers to a wide variety of ready-to-
eat foods and beverages sold and sometimes prepared,
in public places. Street food may be consumed where it
was purchased or can be taken away and eaten else-
where (WHO, 1996). The established food safety know-
how among the surveyed street food vendors regarding
food contamination, types and symptoms of food
diseases was significant since several pathogenic micro-
organisms had also been isolated from many street
vended foods (Omemu et al., 2005). According to WHO
(1989), food handling personnel play important role in
ensuring food safety throughout the chain of food
production and storage. Mishandling and disregard of
hygienic measures on the part of the food vendors may
enable pathogenic bacteria to come into contact with and
in some cases survive and multiply in sufficient numbers
to cause illness in the consumer. Tivadar (2003) high-
lighted the increasing prevalence of eating away from
home and the use of partly or fully cooked food. Most of
the vendors who sold both raw and cooked food items
were not regulated; they operated haphazardly without
any monitoring of what they prepared and how they pre-
pared it (Ekanem, 1998; Abdalla et al., 2008b). Studies
by FAO (1995) recorded poor knowledge, practices in
food handling in the assessment of microbial contamination
*Corresponding author. E -mail: amel33@gmail.com.
of food sold by vendors.
This work was conducted to study the level of food
safety knowledge, practices in food handling and assess-
ment of microbial contamination of food sold by vendors.
MATERIALS AND METHODS
Study population and sample collection
The survey was conducted to evaluate the food safety knowledge
and practices of street food vendors within Atbara city, Nahr Elneel.
The study was carried out between March and April, 2008. Fifty
food vendors operating in the major streets, open air market,
schools, offices and the general hospital were randomly sampled
for this study. The written questionnaire used in this study was a
modified version of a questionnaire from the US Food and Drug
Administration (FDA) on food safety, nutrition and cosmetics (FDA,
2003).
The respondents were 28% males and 72% females, but 38% of
them of age 31-40 and 28% of them were 21-30 old. The education
level of 48% of respondents was primary schools where as 42%
were illiterate. Most of the surveyed people (64%) were married.
The stationary vendors represented 90%. Sixty four percent of the
respondents had the health certificates, where as 36% were not
presented them. The vendors had been in food vending work for
less than 5 years were 78%, but only 2% worked for more than 20
years.
The questionnaire was developed to collect data from street food
vendors. The questionnaire was pre tested for clarity and validity on
10 randomly selected street food vendors in open air market area in
Atbara. Results of the pre-test were used in the revision of the initial
survey tool. The final version of the survey tool contained 26 questions
6968 Afr. J. Biotechnol.
Table 1. Street foods vended within Atbara city (n = 50)
Type Frequency %
Cooked vegetable, soup, sauces, meat, chicken, fish. etc 31 41.8
Porridge 12 16.2
Bean (foul) 1 6.8
Snacks 5 11.2
Bottled drink 4 5.4
juice 9 12.2
Roasted groundnut 4 5.4
which were used to collect data from 50 street vendors on their
socio-economic, health and personal hygiene knowledge of
vendors (hand washing, bathing, food handling and related ail-
ments); and food hygiene and knowledge of food borne illness.
A total of 50 samples of food on sale (30 g) were collected and
placed in separate sterile containers and sent to the laboratory on
ice container for bacteriological examination.
Pieces of each food weighing 10 g were diluted in 90 ml of
phosphate-buffered saline (1:10). All samples were cultured in
nutrient broth, blood and Maconkey’s agars, (Barrow and Feltham,
1993). Biochemical testes were conducted for identification of the
isolates. The total viable counts (TVCs) of the isolated micro-
organisms was carried out according to the method of Miles and
Misra (1938).
Statistical analysis
The data were analyzed with SPSS software (Statistical Package
for the Social Sciences, version 11.5, SSPS Inc and Chicago, IL,
USA). Frequencies as well as the percentages of responses in
each category were computed and all TVCs bacteria were con-
verted to log10 CFU cm-2 for analysis and ANOVA was performed
Cross-tabulation and the 2 test were used to examine the relation-
ships among and between the variables. Statistical significance was
set at a P value of < 0.05.
RESULTS
The street food vended in Atbara city were cooked meals
(41.8%), juice (12.2%) and bottled drink (5.4%), in
additional to other categories (Table 1). It was shown that
health and hygienic practice of the street vendors sur-
veyed in Table 2. The respondents that agreed the hand
must be washed after eating meal (98%) or when hand-
kerchief was used (74%) or even when touching money
or during continuous food handling (62%). Also they were
decided that the vendors should be prevented from
cooking and vending if they were sick (94.0%). Table 3
summarized the knowledge of food handling and 56% of
the vendors were cooked the food during selling but 38.0
% of them reheated the sold food or make adequate
cooking.
Details of knowledge exhibited by respondents on food
borne diseases were shown in Table 4. The most com-
mon contaminants of the food were splinters of wood and
shards of glasses (46.0%) and food colouring, flavoring
and spices (34.0%). The isolated bacteria from cooked
meals, bottled drink and juice were Escherichia coli,
Staphylococcus auerus and Bacillus sp. (Table 5). The
viable counts in cooked vegetables was 4.6, bottled drink
and juice was 3.7 and 4.1 log10 (CFU/ml) respectively.
DISCUSSION
The present survey reveals the knowledge and practices
of street food vendors in Atbara city. Socio-economic and
demographic data showed that most of the food vendors
were females, although, it is not certain whether the pre-
dominance of women in the street food vending trade is
advantageous to food safety (Umoh and Odoba, 1999;
Mensah et al., 2002; Idowa and Rowland, 2006). The
hands are the most important vehicles for the transfer of
organisms from faeces, nose, skin, or other sites to food
(WHO, 1989). In this study, the vendors studied agreed
that the hand must be washed (74.0%), because the
organisms such as Salmonella typhi, non-typhi salom-
nella, Compylobacter spp. and E. coli can survive on
fingers tips and other surfaces for varying periods of time
and some cases after hand washing (Pether and Gilbert,
1971; WHO, 1989). Also clean water supply and hand
washing or toilet facilities are not available to food street
vendors and this in agreement with the findings of Bryan
et al. (1988) and Abdalla et al. (2008a). All these findings
are in disagreement with requirements for effective hand
washing of WHO (1984).
The health and personal hygiene knowledge in this
survey showed that the majority of the vendors must be
done and should not only be triggered by evidences of
visible dirt or objectionable body odour (WHO, 1996;
Abdalla et al., 2008a). Adequate temperature in cooking
and storage of foods is important to minimize the growth
of bacteria (Table 5) and the food that cannot maintain
within the safety temperature zone may act as incubator
for pathogenic bacteria whether the food is raw, partially
cooked or fully done (Roller, 1999; Abdalla et al., 2008b).
The isolation of the pathogenic organisms from vended
food (Table 5) that to ensure the food involved in trans-
mission of pathogenic bacteria. Similarly, pathogenic
organisms such as Hepatitis A, faecal coliform and S.
aureus were isolated from food (Roller, 1999; Bryan et
al., 2003).
Abdalla et al. 6969
Table 2. Health and personal hygiene practices of street food vendors in Atbara city (n = 50).
Topics No. of positive responses %
1. Ailments that temporarily prevented vendors from vending or cooking foods
Cough and colds 47 94.0
Diarrhea 47 94
Nausea 47 94.0
Vomiting 47 94
Sore eyes 47 94.0
Stomach cramps 46 92
Sick member of family 40 80.0
2. Hand washing requirements
Clean water 48 96.0
Soap 42 84.0
Clean hand towel 32 64.0
Disinfecting solution 1 2.0
3. Reasons for hand washing
Touching money 25 50
Handling garbage 42 84.0
Blowing of nose 35 70.0
After eating meals 49 98.0
After using the toilets 46 92.0
Handling raw foods 19 38.0
Scratching 10 20.0
Continuous food handling 23 46.0
Table 3. Food-handling practices of street food vendors in Atbara (n = 50).
Parameter n %
1. Parameters considered in buying food to be cooked or vended
Price 31 62.0
Freshness 29 58.0
Volume 34 66.0
Sold by reputable
manufacturer/wholesaler 14 28.0
2. Food handling practices
Food cooked during sale 28 56.0
Food cooked on morning of sale 4 8.0
Food sold from tray with covering 11 22.0
Food sold from tray with no covering 19 38.0
Food handled at ground level 19 38.0
Food exposed to flies 47 94.0
Food reheated before sale 19 38.0
Adequate cooking of food 19 38.0
Thorough washing of food to be cooked 17 34.0
Use of safe water for cooking 3 6.0
3. Serving of food
Food served with fork/spoon 0 0
Food served with bare hands 30 60.0
Food served into cup/plate 33 66.0
4. Left-over food management used
Throw away 15 30.0
6970 Afr. J. Biotechnol.
Table 2. contd.
Eaten at home 11 22.0
Refrigerated and reheated 1 2.0
No answer/no left-over 8 16
5. Source of water for hand washing and cooking
Tap 30 60
well 22 44
6. Methods used in cleaning utensils
Washing with soap and water 39 78.0
Washing with hot water 4 8.0
Drying with cloths 23 46.0
n = Number of positive response.
Table 4. Knowledge of Food contamination and Symptoms by Street food vendors in
Atbara (n = 50)
Topics n %
1. Familiarity with the term food - borne illness 15 30
2. Types of food contaminants include
worms and parasites 3 6
splinters of wood and shards of glass 23 46.0
invisible germs in foods 5 10.0
Kerosene oil, detergent, or other similar products 14 28.0
Food colouring, flavouring and spices 17 34.0
Insects, insect droppings and dirt 28 56.0
3. Symptoms of food borne illness…
Stomach pain 43 86.0
Diarrhoea 42 84.0
Vomiting 39 78.0
Nausea 34 68.0
Headache 6 12.0
4. Types of food borne illness
Typhoid. . . from contaminated water 18 36.0
Cholera from contaminated water 37 74.0
Dysenteryfrom contaminated food and water 30 60.0
n = Number of positive response.
Table 5. Mean and standard deviation level of Total Viable Count of bacterial detected in street food in Atbara city.
Mean log10CFU/g (ml) ± S.D
Food item Number TVC E. coli S. auerus Bacillus sp.
Cooked vegetable, soup, sauces, meat, chicken, fish etc. 30 4.6 3.2 ± 0.21 3.1 ± 0.25 2.3 ± 0.23
Porridge 10 3.8 2.3 ± 0.23 3.1 ± 0.21 3.2 ± 0.21
Bean (Foul) 12 4.2 3.1 ± 0.25 3.2 ± 0.21 3.2 ± 0.21
Snacks 14 3.3 3.4 ± 0.21 3.2 ± 0.21 3.2 ± 0.23
Bottled drink 20 3.7 3.4 ± 0.21 3.6 ± 0.33 2.3 ± 0.23
juice 20 4.1 3.1 ± 0.21 3.1 ± 0.21 3.6 ± 0.33
Roasted groundnut 8 4.2 3.2 ± 0.21 3.1 ± 0.21 3.1 ± 0.21
In conclusion, the routine medical examination of food
handlers must be carried by health officers in the deve-
lopment of strategic plans towards regulating safe street
food handling, preparation and vending.
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To investigate the microbial quality of foods sold on streets of Accra and factors predisposing to their contamination. Structured questionnaires were used to collect data from 117 street vendors on their vital statistics, personal hygiene, food hygiene and knowledge of foodborne illness. Standard methods were used for the enumeration, isolation, and identification of bacteria. Most vendors were educated and exhibited good hygiene behaviour. Diarrhoea was defined as the passage of > or =3 stools per day) by 110 vendors (94.0%), but none associated diarrhoea with bloody stools; only 21 (17.9%) associated diarrhoea with germs. The surroundings of the vending sites were clean, but four sites (3.4%) were classified as very dirty. The cooking of food well in advance of consumption, exposure of food to flies, and working with food at ground level and by hand were likely risk factors for contamination. Examinations were made of 511 menu items, classified as breakfast/snack foods, main dishes, soups and sauces, and cold dishes. Mesophilic bacteria were detected in 356 foods (69.7%): 28 contained Bacillus cereus (5.5%), 163 contained Staphylococcus aureus (31.9%) and 172 contained Enterobacteriaceae (33.7%). The microbial quality of most of the foods was within the acceptable limits but samples of salads, macaroni, fufu, omo tuo and red pepper had unacceptable levels of contamination. Shigella sonnei and enteroaggregative Escherichia coli were isolated from macaroni, rice, and tomato stew, and Salmonella arizonae from light soup. Street foods can be sources of enteropathogens. Vendors should therefore receive education in food hygiene. Special attention should be given to the causes of diarrhoea, the transmission of diarrhoeal pathogens, the handling of equipment and cooked food, hand-washing practices and environmental hygiene.
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Unsanitary food handling is a major public health hazard. There are over 4,100 mobile food vendors operating in New York City, and of these, approximately forty percent are processing vendors--mobile food units on which potentially hazardous food products are handled, prepared, or processed. This pilot study assesses the food handling practices of 10 processing mobile food vendors operating in a 38-block area of midtown Manhattan (New York City) from 43rd Street to 62nd Street between Madison and Sixth Avenues, and compares them to regulations stipulated in the New York City Health Code. Ten processing mobile food vendors located in midtown Manhattan were observed for a period of 20 minutes each. Unsanitary food handling practices, food storage at potentially unsafe temperatures, and food contamination with uncooked meat or poultry were recorded. Over half of all vendors (67%) were found to contact served foods with bare hands. Four vendors were observed vending with visibly dirty hands or gloves and no vendor once washed his or her hands or changed gloves in the 20-minute observation period. Seven vendors had previously cooked meat products stored at unsafe temperatures on non-heating or non-cooking portions of the vendor cart for the duration of the observation. Four vendors were observed to contaminate served foods with uncooked meat or poultry. Each of these actions violates the New York City Code of Health and potentially jeopardizes the safety of these vendor-prepared foods. More stringent adherence to food safety regulations should be promoted by the New York City Department of Health.