Seroprevalence of Cytomegalo Virus (CMV) among pregnant women in Thika, Kenya
© Maingi and Nyamache; licensee BioMed Central Ltd. 2014
Received: 10 April 2014
Accepted: 24 October 2014
Published: 12 November 2014
The fetal consequences of CMV infection have made it one of the most serious infections contracted during pregnancy. Despite the posed teratogenic risk during pregnancy, there is no national screening test for CMV infection is available during pregnancy in Kenya. Thus little is known on its epidemiological data that is necessary for health planners and care providers.
A cross sectional study was conducted at Thika district level 5 hospital, Kenya to investigate seroprevalence of CMV infections and associated possible risk factors among pregnant women. Structured questionnaires were used to gather socio-demographic data and ELISA was used to detect CMV infections using IgG and IgM.
Out of 260 pregnant women, 201 (77.3%) were CMV IgG 21(8.1%) CMV IgM being on acute stage of the disease. Marital status (OR = 3.7533, 95% CI =3.0231-6.9631, P < 0.0001), parity (OR = 3.7533, 95% CI = 3.0231-6.9631, P < 0.0001), and education (OR = 3.7533, 95% CI = 3.0231-6.9631, P < 0.0001), history of blood transfusion (OR = 0.0374, 95% CI = 0.00120-0.1168, OR = 0.3804) were found to significantly influence seropostivity in univariate analysis.
The 88.4% CMV prevalence rate being detected among pregnant women calls for vaccine and routine screening for CMV infections and its associated risk factors in this kind of settings.
Cytomegalovirus (CMV) is the commonest among viral infections during perinatal period that cause congenital CMV infections . Its clinical manifestations range from asymptomatic forms (90% of cases) to severe fetal damage that may include permanent hearing, vision loss, neurological impairment and, in rare cases, death due to abortion [2–4]. Previous studies have confirmed that CMV infection is relatively common among women of reproductive age with seroprevalence ranging from 45% to 100%. African continent like South America and Asia has one of the highest prevalence of CMV . From the previous studies conducted in Africa, CMV prevalence rates in Egypt were found to be 96% , 85.7% Tanzania , 97.2% Benin  and 86.4% South Africa .
CMV is transmitted from person-to-person via close non-sexual contact, sexual activity, breastfeeding, blood transfusions, and organ transplantation . For pregnant women, important sources of infection include sexual activity and contact with the urine or saliva of young children, especially their own children . However, seroprevalence varies greatly with a variety of epidemiological factors such as geographical distribution, socio-economic status, marital status and parity .
Like other herpes viruses, primary infection is followed with established of lifelong latent infection from which periodic reaction is common . At this stage, symptoms are usually absent including during reaction .
As far as prevention is concerned, in addition to health education campaigns, the serological screening of pregnant women has been proposed. However, there is no consensus in the scientific community concerning the implementation of screening and it is not recommended by any public health system despite its teratogenic effects because of its cost/benefit ratio . However, other countries Israel, Belgium, and France their doctors do test their pregnant patients an intervention to CMV infections that should be adopted by all .
There is no published data concerning CMV seroprevalence in pregnant women in Kenya. The basic data concerning CMV infections during pregnancy is important for health planners and care providers. This study was therefore aimed at determining the seroprevalence, associated possible risk factors for CMV infections among pregnant women in Thika Kiambu County.
To determine the seroprevalence of CMV among the expectant mothers, seeking health services at Thika level 5 hospitals. Consenting pregnant women were approached to participate in the study. A questionnaire was administered and socio-demographic data and blood samples were collected from 260 consenting participants during the period of Sept 2012 to April 2013. The participants were women aged between (18) eighteen years and (45) forty five years old. The participants were sampled from the antenatal clinic. A 5ml blood specimen was obtained for each subject for the evaluation of CMV serum immunoglobulin G antibody using a commercial enzyme-linked immunosorbent assay (Wampole; Inverness Medical Professional Diagnostics) in accordance with the manufacturer’s instructions.
Avidity index among participants with both IgM and IgG antibodies
Univariate and multivariate Odd ratio analysis was conducted and on CMV seropostivity for IgG and IgM and its association between IgG, IgM seropostivity and, high parity >4 deliveries, marital status, history of blood transfusion, HIV status, illiteracy, occupation, and residing location determined and p values less than 0.05 were considered statistically significant.
Socio-demographic characteristics and associated factors with CMV infection of pregnant women in Thika, Kenya
OR = 0.0898
95% CI = 0.0017-4.4637
P = 0.2310
OR = 3.7533
95% CI =3.0231-6.9631
P < 0.0001
OR = 0.2373
One to four
95% CI =0.1246-0.4519
P < 0.0001
P = 0.0003
Trimester of pregnancy:
OR = 1.881
95% CI = 0.4448-2.6617
P = 0.8532
OR = 0.8509
95% CI = 0.4746-1.5256
P = 0.5878
OR = 0.6364
95% CI = 0.0318-12.7301
P = 0.7675
95% CI = 0.2210-1.8359
P = 0.04036
History of blood transfusion:
OR = 0.0374
95% CI = 0.00120-0.1168
P < 0.001
P < 0.003
OR = 0.3804
95% CI = −0.0491-2.9448
P = 0.3546
Out of a total of 260 pregnant women under this study, 201(77.3%) and 21(8%) had seropositive CMV IgG and IgM, respectively (Table 2). Those on the age group between 31–35 year old (54), had the highest IgG seropositive rates IgG 46 (85.19%) while those under age 21–25 years old 52 had the least 7(22.26%). However those who were HIV positive (27), had 23(85.2%) IgG seropositive, Table 2.
Risk factors for CMV infections
Multivariate and univariate analysis was used for CMV IgG and IgM seropositive groups as dependent variable and socio-demographic variables as independent variables. P value <0.05 was considered significant. We therefore determined if age, high parity >4 deliveries, marital status, history of blood transfusion, HIV status, illiteracy, occupation, and residing location had any significance risk to predict CMV infections. However, marital status, high parity, history of blood transfusion and age were significant risk factors for CMV infection. Geographical location and occupation and HIV status were not significantly associated with CMV infection, Table 2.
This is the first published data on the epidemiology of CMV infections among pregnant women in Kenya. Equally few studies have been conducted among pregnant women with most studies being among blood donors. However, in this study, seroprevalence of CMV IgG 77.3% and IgM 8.1% were detected. These findings were similar to those obtained in Sudan (77.2%) . Contrary to previous studies conducted in Africa, higher rates have been reported, in Benin (97.2%) , Egypt (96%) , Gambia (87%) , South Africa (86.4%) , Nigeria (100%), , 87%  Dares Salaam, Tanzania  and also in South East Asia . However, in some of European countries, low CMV infection rates have been reported, Australia (56.9%) and France (46.8%) . The low prevalence rates could be due to the inclusion of CMV screening among the antenatal profile tests and better hygienic standards . The low prevalence rates of CMV in this study compared to the rest of the studies in African countries, could be due to diverse HIV infections (which is an important coinfections with CMV) , diverse socio-demographics, diverse cultures, population behaviour, child cares, breast feeding and sexual activity . The detected 77.3% of CMV infections showed that these women were at high risk of CMV infections.
From this study, we determined the risk factors that could influence HIV infections to CMV infections. From the analysis, women who were married, aged or with high parity, were found to be at higher risk for CMV infection (Table 2). These risk factors were similar to those found by previous studies . These factors increased susceptibility to acquisition of CMV infection, perhaps through the direct contact with contagious secretions from their own children or poor hygiene practiced by these women [25, 26]. In addition, in these settings, most women are usually married based on the customs of most African settings with high number of children.
There is a lot of debate concerning maternal age and CMV infection; however most studies including this study have shown elderly women to be at higher risk of CMV infection , while others reporting contrary [7, 18, 27]. However, other factors like geographical location, education and occupation are not significantly associated with CMV infection.
CMV IgG avidity assay seems to be one of the most accessible tools to differentiate between primary from non-primary CMV infection . This technique is less expensive and it could be used to confirming CMV primary infections without the use of sophiscated polymerase chain reactions. In our study, high CMV IgG avidity were confirmed implying that in these women, their pregnancy could be maintained with a lower risk of transmitting CMV infections to their offspring (Table 1) . However, this study was limited with failure to confirm CMV infections by Polymerase Chain Reaction (PCR) including failure to make a follow up of IgM seropostivity women to ascertain their infection status/seroconversion.
This study shows the prevalence of 77.3% similarly to those obtain from other countries with those married aged and with high parity being at a high risk to CMV infections. This study concurs with previous studies that have suggested all women of the child bearing age to be incorporated in routine antenatal screening profile.
This study was approved by Kenyatta University Ethical review committee.
The authors would like to thank all the expectant women for participating in this study. The study was funded from the accrued funds generated within the department of Medical laboratory sciences, Kenyatta University.
- De Paschale M, Agrappi C, Manco MT, Paganini A, Clerici P: Incidence and risk of cytomegalovirus infection during pregnancy in an urban area of Northern Italy. Infect Dis Obstet Gynecol. 2009, 5-doi:10.1155/2009/206505Google Scholar
- Alford CA, Stagno S, Pass RF, Britt WJ: Congenital and perinatal cytomegalovirus infections. Rev Infect Dis. 1990, 12 (7): 745-753. doi:10.1093/clinids/12.Supplement_7.S745 2View ArticleGoogle Scholar
- Tabatabaee M, Tayyebi D: Seroepidemiologic study of human cytomegalovirus in pregnant women in Valiasr Hospital of Kazeroon, Fars, Iran. J Matern Fetal Neonatal Med. 2009, 22 (6): 517-521. 10.1080/14767050902801678. doi:10.1080/14767050902801678PubMedView ArticleGoogle Scholar
- Cannon MJ, Scott Schmid D, Terri B: Hyde review of cytomegalovirus seroprevalence and demographic characteristics associated with infection. Rev Med Virol. 2010, 20: 202-213. 10.1002/rmv.655.PubMedView ArticleGoogle Scholar
- Kamel N, Metwally L, Gomaa N, Sayed Ahmed WA, Lotfi M, Younis S: Primary cytomegalovirus infection in pregnant Egyptian women confirmed by cytomegalovirus IgG avidity testing. Med Princ Pract. 2013, doi:10.1159/000354758Google Scholar
- Mhalu F, Haukenes G: Prevalence of cytomegalovirus antibody in pregnant women, AIDS patients and STD patients in Dar es Salaam. AIDS. 1990, 4 (12): 1294-1295. 10.1097/00002030-199012000-00022.PubMedView ArticleGoogle Scholar
- Rodier MH, Berthonneau J, Bourgoin A, Giraudeau G, Agius G, Burucoa C, Hekpazo A, Jacquemin JL: Seroprevalences of Toxoplasma, malaria, rubella, cytomegalovirus, HIV and treponemal infections among pregnant women in Cotonou, Republic of Benin. Acta Trop. 1995, 59 (4): 271-277. 10.1016/0001-706X(95)00087-U.PubMedView ArticleGoogle Scholar
- Bos P, Steele AD, Peenze I, Aspinall S: Sero-prevalence to hepatitis B and C virus infection in refugees from Mozambique in southern Africa. East Afr Med J. 1995, 72 (2): 113-115.PubMedGoogle Scholar
- Stagno S: Cytomegalovirus. Infectious Diseases of the Fetus and Newborn Infant. Edited by: Remington JS, Klein JO. 2001, Philadelphia: W.B. Saunders Company, 389-424.Google Scholar
- Pass RF, Hutto C, Ricks R, Cloud GA: Increased rate of cytomegalovirus infection among parents of children attending daycare centers. N Engl J Med. 1986, 314: 1414-1418. 10.1056/NEJM198605293142204.PubMedView ArticleGoogle Scholar
- Bawaraju A, Mane PM, Vijayadurga S: The reactivation of the cytomegalovirus (CMV) infection in HIV infected patients. J of Clinical and Diagnostic Research. 2011, 5 (4): 749-751.Google Scholar
- Rautemaa R, Helander T, Meri S: Herpes simplex virus 1 infected neuronal and skin cells differ in their susceptibility to complement attack. Immunology. 2002, 106 (3): 404-411. 10.1046/j.1365-2567.2002.01421.x.PubMedPubMed CentralView ArticleGoogle Scholar
- Boppana SB, Rivera LB, Fowler KB, Mach M, Britt WJ: Intrauterine transmission of cytomegalovirus to infants of women with preconceptional immunity. N Engl J Med. 2001, 344: 1366-1371. 10.1056/NEJM200105033441804.PubMedView ArticleGoogle Scholar
- Revello MG, Gerna G: Diagnosis and management of human cytomegalovirus infection in the mother, fetus, and newborn infant. Clin Microbiol Rev. 2002, 15 (4): 680-715. 10.1128/CMR.15.4.680-715.2002.PubMedPubMed CentralView ArticleGoogle Scholar
- Hamdan HZ, Abdelbagi IE, Nasser NM, Adam I: Seroprevalence of cytomegalovirus and rubella among pregnant women in Western Sudan. Virol J. 2011, 8: 217-10.1186/1743-422X-8-217.PubMedPubMed CentralView ArticleGoogle Scholar
- el-Nawawy A, Soliman AT, El Azzouni O, Amer e-S, Karim MA, Demian S, el-Sayed M: Maternal and neonatal prevalence of toxoplasma and cytomegalovirus (CMV) antibodies and hepatitis-B antigens in an Egyptian rural area. J Trop Pediatr. 1996, 42 (3): 154-157. 10.1093/tropej/42.3.154. doi:10.1093/tropej/42.3.154PubMedView ArticleGoogle Scholar
- Bello C, Whittle H: Cytomegalovirus infection in Gambian mothers and their babies. J Clin Pathol. 1991, 44 (5): 366-369. 10.1136/jcp.44.5.366. doi:10.1136/jcp.44.5.366PubMedPubMed CentralView ArticleGoogle Scholar
- Schoub BD, Johnson S, McAnerney JM, Blackburn NK, Guidozzi F, Ballot D, Rothberg A: Is antenatal screening for rubella and cytomegalovirus justified?. S Afr Med J. 1993, 83 (2): 108-110.PubMedGoogle Scholar
- Williams JO, Fagbami AH, Omilabu SA: Cytomegalovirus antibodies in Nigeria. Trans R Soc Trop Med Hyg. 1989, 83 (2): 260-10.1016/0035-9203(89)90671-8.PubMedView ArticleGoogle Scholar
- Taechowisan T, Sutthent R, Louisirirotchanakul S, Puthavathana P, Wasi C: Immune status in congenital infections by TORCH agents in pregnant Thais. Asian Pac J Allergy Immunol. 1997, 15 (2): 93-97.PubMedGoogle Scholar
- Picone O, Vauloup-Fellous C, Cordier AG: A 2-year study on cytomegalovirus infection during pregnancy in a French hospital. BJOG. 2009, 116: 818-10.1111/j.1471-0528.2009.02139.x.PubMedView ArticleGoogle Scholar
- Guerra B, Simonazzi G, Banfi A, Lazzarotto T, Farina A, Lanari M, Rizzo N: Impact of diagnostic and confirmatory tests and prenatal counseling on the rate of pregnancy termination among women with positive cytomegalovirus immunoglobulin M antibody titers. AJOG. 2007, 196: 221.e1–6-View ArticleGoogle Scholar
- Fabiani M, Nattabi B, Opio AA, Musinguzi J, Biryahwaho B, Ayella EO, Ogwang M, Declich S: A high prevalence of HIV-1 infection among pregnant women living in a rural district of North Uganda severely affected by civil strife. Trans Roy Soc Trop Med Hyg. 2006, 100 (6): 586-593. 10.1016/j.trstmh.2005.09.002. doi:10.1016/j. trstmh.2005.09.002PubMedView ArticleGoogle Scholar
- Peckham CS, Johnson C, Ades A, Pearl K, Chin KS: Early acquisition of cytomegalovirus infection. Arch Dis Child. 1987, 62 (8): 780-785. 10.1136/adc.62.8.780. doi:10.1136/ adc.62.8.780PubMedPubMed CentralView ArticleGoogle Scholar
- Kramer A, Schwebke I, Kampf G: How long do nosocomial pathogens persist on inanimate surfaces? A systematic review. BMC Infect Dis. 2006, 6: 130-10.1186/1471-2334-6-130. doi:10.1186/1471-2334-6-130 28PubMedPubMed CentralView ArticleGoogle Scholar
- Bate SL, Dollard SC, Cannon MJ: Cytomegalovirus seroprevalence in the United States: the national health and nutrition examination surveys, 1988–2004. Clin Infect Dis. 2010, 50 (11): 1439-1447. 10.1086/652438. doi:10.1086/652438PubMedView ArticleGoogle Scholar
- Bukbuk DN, el Nafaty AU, Obed JY: Prevalence of rubella-specific IgG antibody in non-immunized pregnant women in Maiduguri, north eastern Nigeria. Cent Eur J Public Health. 2002, 10 (1–2): 21-23.PubMedGoogle Scholar
- Luerez- Ville M, Seller Y, Salomon LJ, Stirnemann JJ, Jacquemard F, Ville Y: Prediction of fetal infection in cases with cytomegalo virus immunoglobulin M in the first trimester of pregnancy, a retrospective cohort. Clinical infection Dis. 2013, 56: 1428-1435. 10.1093/cid/cit059.View ArticleGoogle Scholar
- Duff P: A Thoughtful algorithm for the accurate diagnosis of primary CMV infection in pregnancy. Obstet Gynaec. 2007, 196: 196-197.Google Scholar
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