Muhammad Yousuf ( Department of Medicine, Post Graduate Medical Institute and Lahore General Hospital, Lahore. )
Ashraf Nadeem ( Department of Pathology, King Abdul Aziz Hospital, Madinah Al-Munawarah, Saudi Arabia. )
Objective: To study the profile of meningococcal infection among pilgrims depsite prior A-C vaccination. Setting: King ;\\\\bdul Aziz Hospital, \\\\ladinah Al—N unawarah, Saudi Arabia.
Subjects and Methods: Fifteen patients admitted to the hospital during the stydy period of April 1992 to June 1993 were evaluated prospectively regarding their clinical and laboratory features, culLure and antibiotic sensitivity and meningococcal serotypes.
Results: Twelve cases presented as meningitis while 3 cases had meningococcaemia Most (53.3%) were from Pakistan while rest were from 6 other countries. Clinical and laboratory features at presentation were similar as reported in the literature. In 13 cases where serotvping could be done, most belonged to group A (54%) and C (23%). i\\\\ntimicrobial sensitivity showed the isolates to be sensitive to most of the antibiotics commonly used to Ireat this infection. Mortality was 33% with the poorest outcome in patients with W135 infection.
Conclusion: This study underscores the need of further studies in Makkah and Madinah, Saudi Arabia to find out the serotypes and immunological factors responsible for meningococcal infection in A—C vaccinated pilgrims so as to explore the possibility of use of poly lent meningococcal vaccine (JPMA 50:184, 2000).
Around two million Muslims gather in the I lolv cities of Makkah and Madinah in the Kingdom of Saudi Arabia for Haj pilgrimage every year. Apart from these, Muslims from all over the world visit these cities throughout the year for Um rah pilgrimage.
Despite the best health care facilities provided by the Saudi Government. this gathering is ati ideal ground for spread of epidemics. Upto twenty years ago, cholera was the main infection responsible for morbidity and mortality among pilgrims1. liven as recently as 1986. gastroenteritis was responsible for 76% of hospital admission2. Now pneumonia is the main infect ion in patients needing hospitalization3.
An epidemic of group A men ingococcal infection occurred during the 19871 laj season with a high mortality4,5 and another outbreak occurred in Makkah in 1992. Pakistanis comprised most of the affected pilgrims with mortality upto 26.7%6. A fter the introduction of compulsory vaccination against group A and C meningococci, although the number of cases of meningococcal infection has reduced, vet rare variants such as group W 135, are assuming increasing importance with high mortality7.
However there is no information on the source and the type of sporadic meningococcal infection in such pilgrims with compulsory A and C meningococcal vaccination. This study describes our experience of meningococcal infection in pilgrims visiting Madinah AHM unawarah, Saudi Arabia in the post—vaccination era.
Patients and Methods
This study was conducted in King Abdul Aziz Hospital. Madinah A l-M unawarah Saudi Arabia from April 1992 to June 1993. This is the main hospital situated near the Holy Prophets mosque and provides emergency admissions to the pilgrims.
All pilgrims admitted during the above mentioned period. with a diagnosi of meningococcal meningitis or meningococcaemia were included in the study. Diagnosis of meningococcal infection was made on the basis of clinical features. cerebrospinal fluid (CSF) examination and CSF smear for gram negative diplococci.
Cultures of CSE blood and scrapings from the petichae (where present) were done on chocholate agar media and a commercial latex agglutination kit (Welicome) was used fbr serotyping of the meningococci. In culture positive cases, antimicrobial sensitivity of the isolated meningococci was tested by using the various antibiotic discs available in the hospital. All Patients were treated with heavy doses of parenteral penicillin G alongwith either chloramphen icol or third generation cephalosporins. Other observations in pilgrims included age. sex, nationality, type of presentation, clinical features serotype of meningococci isolated and the outcome.
Since the introduction of compulsory meningococcal vaccination against serotypes A and C, the prevalence of cases of meningococcal disease among pilgrims has significantly decreased. However. 77% of cases were due to serotypes A and C, against which these pilgrims were reported to be vaccinated. This could be because of false certificates of vaccination or poor quality vaccine. This can also be due to deficiency of protein C and S8, complement deficiency could not be investigated in these patients. However, HIV test was negative in both cases with fatal meningoccaemia due to serotype WI 357. Clinical features in patients with meningitis included fever. headache and signs of meningeal irritation 13 but none of the patients with meningococcaemia had signs of meningeal irritation.
All patients who died were old males with a mean age 62 years. This was despite the fact that the antibiotics used had a high in-vitro sensitivity against meningococci. This could be attributed to delay in presentation to the hospital as the prognosis can be improved by prompt institution of antibiotic therapy in suspected cases of bacterial meningitis even before lumber puncture 14. Just like in Makkah6, Pakistani pilgrims were more commonly affected as compared to pilgrims from other countries.
With the availability and effectiveness of polyvalent meningococcal vaccine against group A,C,Y and W13515, there is a need to use such a vaccine for intending pilgrims to avoid any future epidemics by rare and fatal types of meningococcl. Respiratory viruses and mycoplasma have been implicated as cofactors for group A meningococcal 16.
Our study is a small one and future larger and long term studies in Mad inah and Makkah are needed to validate the our findings. It it also necessary to study the possible immune deficiency in pilgrims, having infection with serotypes for which they have been vaccinated. This study also underscores the necessity to study the serotypes and antimicrobial sensitivity pattern of memngococcal infections in Pakistan, because most of the pilgrims were from Pakistan.
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