Salmonella Typhi 2012
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Transcript of Salmonella Typhi 2012
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Salmonella enterica serovar Typhi
Prof. Mochammad Hatta, MD, Ph.D, Clin Micro (Cons)
Dept Microbiology, Molecular Biology and ImmunologyLaboratory, Fac.Medicine, Hasanuddin University,
Makasssar, Indonesia
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INTRODUCTION
Discovered in 1880 & named after Daniel
Salmon, the pathologist who first isolated the
organism from porcine intestine.
Salmonella is a motile, gram-negative, rod-
shaped bacteria, which is a leading cause of
bacterial food-borne diseases.
Of the 2000 strains recognized, human
infection are caused mainly by 5 serotypes,
typhi, paratyphi, typhimurium, choleraesuis &
enteritidis.
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Salmonella typically produces 3 distinct
syndromes: food poisoning, typhoid fever &
asymptomatic carrier state.
Salmonella gastroenteritis manifest as vomiting
& diarrhea within 6-48 hours after ingestion of food
or drink contaminated with bacteria.
SALMONELLOSIS
It is self-limiting, treatment is by water & salts
replacement. Antibiotics are not usually needed.
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TYPHOID FEVER
Caused by salmonella typhi & paratyphi.
Incubation period is 1-2 weeks.
Typhoid fever is the most serious salmonella
infection with significant morbidity & mortality.
Salmonella has somatic (O antigen) & flagellar H
antigen. The O antigen is more specific for
serologic testing.
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An estimated 15-30 million cases of typhoid
fever occur globally each year.
FREQUENCY
Incidence in Sudan is not exactly known, but
estimated as 50 per 100,000 people/year.
The disease is endemic in many developing
countries in Asia, Central America & Africa.
Outbreak of typhoid fever have been reported
recently from Eastern Europe.
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PRECIPITATING FACTORS
Defects in cellular-mediated immunity (AIDS,
Transplant patients & malignancy).
Defects in phagocytic function (malaria,
histoplasmosis & schistosomiasis).
Low stomach PH ( patients on anti-ulcer drug).
Prolonged use of antibiotics (altered gut flora).
Injured gut barrier (bowel disease or surgery).
Splenectomy or functional asplenia (sickle cell dis)
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MORTALITY & MORBIDITY
Whereas mortality caused by typhoid fever israre in western countries, it is associated with
significant mortality & morbidity in tropical
countries (10-30%).
Dehydration is the most common complication
of typhoid fever, but serious intestinal & extra-
intestinal complications may occur.
Infection with nontyphoidal salmonella produces
self-limiting gastroenteritis and food poisoning.
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PATHOPHYSIOLOGY
After ingestion salmonella must survive the
stomach acidic PH & colonize small intestine.
Another portal of entry is invasion of lymphoidtissue in the GIT (peyer patches) & multiplication
within macrophages leading to bacteremia.
Salmonella then attach to & penetrate the gutmucosa resulting in diarrhea from direct
mucosal damage & by action of exotoxins.
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Mochammad Hatta
• Viability : death point : 56o C
• In soil survival for 6 weeks
• Pathogenesis : infection by ingestion --- small intestinal via
lymphatics --- mesenteric glands -- multiplication --- blood via
thoracic duct --- bacteriaemic phase ( 1 - 10 days) : infection
liver, gall bladder, spleen, kidney & bone marrow.
Gall bladder --- invasion lymphoid tissue -- Peyer’s patches
& lymphoid follicles -- acute inflammatory reactions --- ulcer
haemorrhage -- perforation & necrosis
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Mochammad Hatta
POSITIVE CULTURE AND IgM ANTIBODY RESPONS IN TYPHOID
FEVER
010
20
30
40
50
60
70
80
90
100
1 2 3 4 5 6 7 8
Weeks
% P
o s i t i v e
BloodFaeces
Urine
IgM
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DIFFERENTIAL DIAGNOSES
Cryptosporidiosis
Cyclospora
Campylobacter infection
Listeria monocytogenes
Escherichia Coli infection
Shigellosis
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LAB FINDINGS
Salmonella can be grown from blood or bone
marrow in the 1st week, from stool in the 2nd
week & from urine in the 3rd week.
Special media are needed for transport & for
culture.
leukopenia is typical but WBC may be normal.
Widal test is not diagnostic, titer > 1:320 or 4
fold increase in titer support the diagnosis.
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Typhoid feverLaboratory diagnosis
Polymerase Chain Reaction (PCR)
Culture of blood or bone marrow
80% during first week
Culture of urine or stool
in presence of characteristic clinical picture
Serology test
antibody test against somatic (O) or
flagellar (H) antigen
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Mochammad Hatta
Deteksi Salmonella typhi dengan Nested PCR
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Typhoid fever
(nested)
ST1 : 5’-ACT GCT AAA ACC ACT ACT-3’
ST2 : 5’-TTA ACG CAG TAA AGA GAG-3’
ST3 : 5’-AGA TGG TAE TGG CGT TGC TC-3’
ST4 : 5’-TGG AGA CTT CGG TCG CGT AG-3’
(M. Hatta & Henk L Smits. American J.Tropical Medicine & Hygeine, 2007)
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Mochammad Hatta
Hasil nested PCR S.typhi dari penderitademam tifoid
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MDR PCR product S.typhi Vietnam and Indonesian isolated
Vietnam Indonesia
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MDR PCR product S.typhi Vietnam isolated
941 bp
819
639
310
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PCR for the detection of S. typh i specific DNA in blood, stool and urine
samples from patients with suspected typhoid fever .
No (%) of patients with the following result
Patient group Blood Faeces Urine Neg Pos Neg Pos Neg Pos
Culture positive 1 (1) 71 (99) 16 (67) 8 (33) 22 (38) 36 (62)
Culture negative 21 (45) 26 (55) 7 (41) 10 (59) 11 (28) 28 (72)
Non-typhoid patients 12 (100) 0 (0) 2 (100) 0 (0) 10 (100) 0 (0)
(INCO-DC EC Research project Report, 2002)
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Mochammad Hatta
CONSTRAINTS OF PCR TECHNIQUE 1. Quite expensive
2. Need special equipment
3. Need high skill and laboratory
4. Sophisticated
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Mochammad Hatta
Salmonellabacteria on
MacConkey agar
Lactose-positivebacteria showpink colonies
(upper left)
Lactose-negative
bacteria have
colorlesscolonies (lowerright)
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Biochemical reactions for identification of S.typhi by the API 20E procedure
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Mochammad Hatta
Black colonies of Salmonella
typhi aftergrowth onbismuth
sulfite agar
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Dipstick for Typhoid Fever
Procedure Add 5µl serum to 250µl detection reagent Incubate dipstick for 3 hours
Rinse with tap water Read by visual inspection
Result
(Mochammad Hatta, et al. American J. TropicalMedicine & Hygiene, 2002)
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Mochammad Hatta
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Dipstick for Typhoid Fever
Procedure Add 5µl serum to 250µl detection reagent Incubate dipstick for 3 hours Rinse with tap water
Read by visual inspection
ResultPatients with
clinical
suspicion of
typhoid fever from Makassar,
Indonesia
Control
Test
Typhoid Fever Dipstick
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Mochammad Hatta
Typhoid Fever Dipstick CTD, Ho Chi Minh City, Viet Nam
Comparison of tests
Test Sensitivity (%) Specificity (%)
IgM ELISA 1:400IgG ELISA 1:1.600
IgA ELISA 1:200
756852
949295
Widal O1:400
Widal H 1:2004760 9398
Dipstick 77 95
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Mochammad Hatta
Typhoid Fever Dipstick Semarang, Indonesia
Patient group,culture result
Number positive (%) / total
Dr. Kariadi Hospital(bone marrow culture)
S. typhi positiveS. typhi negative
3 district hospitals(blood culture)
S. typhi positiveS. typhi negative
38 (70.4) / 540 (0) / 2
32 (86.5) / 372 (7.7) / 26
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Mochammad Hatta
Typhoid Fever Dipstick Makassar, Indonesia
Patient group No. positive (%) /total
Suspects
Clinical diagnosis: typhoid S. typhi culture positive S. paratyphi culture positive
Culture negative
Clinical diagnosis: otherCulture negative
Hospital controlsSchool children
85 (47.5) / 17973 (65.2) / 1124 (66.6) / 6
8 (13.1) / 61
0 (0) / 64
0 (0) / 2592 (1) / 194
Typhoid Fever Dipstick
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Mochammad Hatta
Typhoid Fever Dipstick Makassar, Indonesia
Follow-up
Sample DPO No. positive (%) /Total
S. typhi culture positiveFirstSecondThird
S.typhi culture negativeFirstSecondThird
81529
61327
30 (76.9) / 3932 (82.1) / 3938 (97.4) / 39
2 (4.3) / 4736 (76.6) / 4739 (83.0) / 47
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Mochammad Hatta
Typhoid feverCulture and Dipstick
Assay
Culture
Dipstick
Sensitivity
65.9%
47.5%
Specificity
100%
95%
PPV
100%
92%
NPV
74%
65%
Dipstick: finger prick blood, same day result
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Rapid test for typhoid fever
80% sensitivity compared with bloodculture
PPV (92%) and NPV (64%) somewhatlower than that of culture
Same day result
Easy to perform
High stability of components
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DIPSTICK FOR DETECT IGM ANTIBODIES 1. Simple and rapid
2. Required no equipment3. Highly stable reagents
4. Low cost
5. Easy to applied in field
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TYPHOID Lateral FlowPrinciple
Immunochromatographic strip assay
Test Control
Sample pad / Conjugate Detection strip Sink
blood cell pad
separation filter
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TYPHOID Lateral FlowMethod
Add 5l serum
Add 130l sample fluid
Wait 10 minutes Read result Sample well
Control line
Test line
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Mochammad Hatta
Typhoid Fever Latex Agglutination
5 seconds 15 seconds
45 seconds > 60 seconds
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What is S.typhi ?
A bacteria
Causes typhoid fever that affects 16
million people annually and causes600,000 fatalities
Has evolved the ability to spread from theintestine to the deeper tissues of humans,including the liver, spleen, and bonemarrow
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What is it? Cont…
Resistant to many drugs
Closely related to Salmonella typhimurium (also
already sequenced), classified under the samespecies as Salmonella typhi
Difference is that S. typhi causes typhoid feverand can only infect humans, whereas S.
typhimurium causes food poisoning and canaffect almost all animals
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Where and When? Sequenced by the Sanger Institute
On November 7, 2001
Mochammad Hatta. How diversity flagella variants of S. Typhi strains in
Indonesia Archipelago?. Wellcome Trust Advanced Course: Molecular Basis of Bacterial Infection: Basic and Applied Research Approaches . Wellcome Trust Genome Campus, The Sanger Institute,Hinxton, Cambridge, United Kingdom (UK), 11-17 May 2008. page 12-13.
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Why?
It affects millions of people andsequencing the genome can help us find a
way to block its transmission in humans,eradicating it altogether
Can help improve diagnostic tools and
vaccines
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Why?
Multiple drug resistance (MDR) is aemerging problem in treating infectious
diseases Salmonella typhi is one example of MDR
microorganism
It is resistance to fluoroquinolones, themost effective antimicrobials for thetreatment of typhoid fever
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So…..?
Since salmonella typhi is an example of anemerging MDR microorganism, studying
this genome can contribute to theunderstanding of how suchmicroorganisms adapt rapidly to new
environmental changes that are presentedby modern human society.
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Some Statistics
Chromosome sequence is 4,809,037 bp inlength
C+G content of 52.09% 4,599 protein-coding genes (402 of these
are pseudogenes)
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Side Note:
Pseudogene: once functional stretches of DNA that have been inactivated by
mutation
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Some Results
The genome shows hundreds of deletionsand insertions, resulting in MDR
Found the plasmid in Salmonella typhi thatencodes resistances to all of the first-linedrugs used for the treatment of typhoidfever
Many other genes responsible forresistance in drugs were indentified
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Side Note
Plasmid: A piece of symbiotic DNA, mostlyin bacteria but also in yeast, not forming
part of the normal chromosome DNA of the cell and capable of replicatingindependently of it. Plasmids carry asignal situated at their replication origin
dictating how many copies are to bemade, and this number can be artificiallyincreased.
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Results Cont…
Salmonella typhi’s genome gives us hintsas to why it only infects humans
Because it has 204 pseudogenes. Workingversions of these genes were discardedduring typhi’s evolution for its currenthabitat in humans
Vs. typhimurium only has about 40pseudogenes
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Results Cont…
Both typhi and typhimurium havehundreds of genes that are different. This
is very surprising because these twoorganisms are classified as a singlespecies
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CLINICAL PICTURE
Symptoms begin with sudden onset of high-
grade fever, headache & dry cough.
Fever is swinging or may show step ladder
pattern & patient initially feel well & mobile.
Abdominal pain & toxicity follow soon & by
the end of 1st week spleen is palpable & pink,
discrete, skin rash appears over the trunk.
Constipation is more common than diarrhea
which is usually greenish in color (pea soup).
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CLINICAL PICTURE/2
Abdominal tenderness & hepatomegaly occur
in 50% of patients.
The pulse is relatively slow in relation to fever (Paget sign).
The tongue is coated with free margins &
halitosis may be present.
The sweat of some patients smell like yeast.
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CLINICAL PICTURE/3
The 3rd week of illness is the usual time for
complications in the untreated patients.
Local gut as well as systemiccomplications may occur.
Serious infections may progress rapidly to
drowsiness & coma which is usually fatal(coma vigil).
Mortality is unlikely after the 4th week &
patients may become carrier if not treated.
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Intestinal hemorrhage
Paralytic ileus
Intestinal perforation
LOCAL COMPLICATIONS
Zenker degeneration of abdominal muscles
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Endocarditis
Arteritis & arterial emboli
Cholecystitis
SYSTEMIC COMPLICATIONS
Osteomyelitis & septic arthritis
Hepatic & splenic abscesses
Pneumonia or empyema
Meningitis
Urinary tract infection
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TREATMENT
Medical care include rehydration, antipyretics& antibiotics.
Drugs of choice are Ceftriaxone & ciprofloxacin
but Cotrimoxazole & Chloramphenicol are stillused in developing countries. Ampicillin kills
bacilli hiding in the bile & hence prevents or
reduce the carrier state.
Chronic resistant carrier state may necessitate
cholecystectomy. Surgical care may also be
needed in patients with intestinal complications.
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NURSING CARE
Isolation & barrier nursing is indicated
Trace source of infection.
continue breastfeeding infants & young children
and give ORS & light diet for other patients in the
first 48 hours.
Notification of the case to the infection control
nurse in the hospital.
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PREVENTION
Education on hygiene practices like hand
washing after toilet use & avoidance of eating in
non hygienic restaurants.
Antibiotic prophylaxis is not needed for
house-hold contacts.
Proper handling & refrigeration of food even
after cooking.
Salmonella TAB vaccine is available but
affectivity is low (50% claimed protection).
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PROGNOSIS
With early diagnosis and prompt treatmentmost patients with typhoid fever will recover in
due time.
Fever & toxicity subsides within 72 hours of antibiotic treatment.
Mortality is > 50% in untreated severe typhoid
fever particularly in children & elderly.
Recrudescence is rare but chronic carrier
state is reported in 10% of patients.
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Infection follows ingestion of contaminated
food or water. Meat, poultry, eggs & diary
products are frequent sources.
TRANSMISSION
Pets, domestic animals and infected human
are potential reservoirs. Person to person &
animal to human transmission is recognized.
In healthy humans a dose of about one million
bacteria is necessary to produce symptoms.
f
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References
Mochammad Hatta, Mirjam Baker, Stella van Beer, Theresia H Abdoel, Henk L Smits. Risk factors for clnical typhoid fever in villages in Rural South Sulawesi, Indonesia. International Journal of Tropical Medicine . Vol 4 (3): 91-99, (2009)
Mochammad Hatta and Ratnawati. Enteric fever in endemic areas of Indonesia: an increasingproblem of resistance. J. Infection Developing Countries (JIDC ). Vol 2(4); 298-301 (2008)
Rob Pastoor, Mochammad Hatta, Theresia H. Abdoel, Henk L. Smits. Simple, rapid andaffordable point-of-care test for the serodiagnosis of typhoid fever. J. Diagnostic Microbiology and Infectious Disease . Vol 61:(2);129-134, Feb (2008).
Mochammad Hatta and Henk L Smits. Detection of Salmonella typhi by nested PolymeraseChain Reaction in blood, urine and stool samples. American J. Tropical Medicine Hygiene.vol: 76;139-143 (2007).
Theresia H. Abdoel, Rob Pastoor, Henk L. Smits, Mochammad Hatta, Laboratory evaluation of a simple and rapid latex agglutination assay for the serodiagnosis of typhoid fever. Transactions of the Royal Society of Tropical Medicine and Hygiene . vol. 101 (10); 1032-1038 (2007)
Mochammad Hatta, Marga D.A Goris, Evy Heerkens, George C Gussenhoven, Jairo Goosken,Henk L Smits. Simple dipstick assay for the detection of Salmonellla typhi -specific immunoglobulinM antibodies and the evolution of the immune response in patients with typhoid fever American J. Tropical Medicine and Hygiene . vol 66: no 4; 416-421 (2002).
Mochammad Hatta, Mubin Halim, Theresia Abdoel, Henk L. Smits. Antibody response intyphoid fever in endemic Indonesia and relevance of serology and culture to diagnosis.Southeast Asian Journal of Tropical Medicine and Public Health . vol 33: no 4; 182-191(2002)