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Letter to the Editor - Study Letter
2018:84:3;328-331
doi: 10.4103/ijdvl.IJDVL_579_17
PMID: 29620046

Clinical profile and virology analysis of hand, foot and mouth disease cases from North Kerala, India in 2015–2016: A tertiary care hospital-based cross-sectional study

Sasidharanpillai Sabitha1 , Sarita Sasidharanpillai2 , Ramachandran E Sanjay3 , Manikoth Payyanadan Binitha2 , Najeeba Riyaz2 , Kunnummal Muhammed2 , Tapron Smitha2 , Aparna S Vidya2 , Kambiam Veettil Vaishnavi2 , Thalekkara Madhavan Saranya2 , Govindakaranavar Arunkumar3
1 Department of Pediatrics, Government Medical College, Kozhikode, Kerala, India,
2 Department of Dermatology and Venereology, Government Medical College, Kozhikode, Kerala, India
3 Department of Virus Research, Regional Reference Laboratory for Influenza Viruses and ICMR Virology Network Laboratory-Grade-I, Manipal Academy of Higher Education, Manipal, Karnataka, India

Correspondence Address:
Sarita Sasidharanpillai
‘Rohini,’ Girish Nagar, Nallalom PO, Kozhikode - 673 027, Kerala
India
Published: 04-Apr-2018
How to cite this article:
Sabitha S, Sasidharanpillai S, Sanjay RE, Binitha MP, Riyaz N, Muhammed K, Smitha T, Vidya AS, Vaishnavi KV, Saranya TM, Arunkumar G. Clinical profile and virology analysis of hand, foot and mouth disease cases from North Kerala, India in 2015–2016: A tertiary care hospital-based cross-sectional study. Indian J Dermatol Venereol Leprol 2018;84:328-331
Copyright: (C)2018 Indian Journal of Dermatology, Venereology, and Leprology

Sir,

Hand, foot and mouth disease manifests with low-grade fever along with vesicles or papules on oral mucosa, palms, soles and buttocks.[1],[2] Rash affecting face, perioral area and trunk and rash more than 0.5 cm in size are considered as features of atypical hand, foot and mouth disease.[3],[4],[5]

We conducted a study to describe the clinical features and etiology of hand, foot and mouth disease in patients attending the Dermatology Department of Government Medical College, Kozhikode, Kerala, India.

The first 60 patients who attended the Dermatology Outpatient Department of our institution from September 1, 2015 with clinically diagnosed hand, foot and mouth disease were included in the study, after obtaining written informed consent from individual patient (or the guardian in case of children below 18 years). Ethical clearance was obtained from Ethics Committee of our institution and Manipal Academy of Higher Education where the viral study was carried out.

Patients who were diagnosed to have probable or definite drug reaction as per World Health Organization causality assessment and patients showing multinucleated giant cells in Tzanck smear analysis were excluded from the study.[6]

Using a predesigned proforma, data on patient profile and clinical manifestations were collected from each patient. The subjects were classified into those with limited rash, extensive rash and generalized rash [Table - 1]. Those who manifested with rash affecting face, perioral area or trunk and those who presented with skin lesions of size 0.5 cm or more were categorized as atypical hand, foot and mouth disease.[4]

Table 1: Clinical characteristics of hand, foot and mouth disease patients attending the dermatology department

Swabs collected by rupturing intact vesicle with a sterile needle or from oral erosion or posterior pharynx (in the absence of intact vesicle) were transported in viral transport medium for virology workup.[7],[8],[9] The data were analyzed. Thirty eight patients (63.3%) tested positive for enterovirus by real-time polymerase chain reaction [Table - 1]. Serotyping identified Coxsackievirus A16 (4, 6.7%), Coxsackievirus A6 (31, 51.7%) and untyped enteroviruses (3, 5%) as the causative agents [Table - 1]. Age of the study group ranged from 8 months to 34 years with slight male predilection (32 males and 28 females, 1.1:1).

Clinical manifestations documented in the study group were tabulated as shown in [Table - 1], [Table - 2], [Table - 3] [Figure - 1]. Adults manifested more pronounced constitutional symptoms when compared to children. Three patients gave previous history suggestive of hand, foot and mouth disease in the same season. Three children (5%) manifested with hand, foot and mouth disease without any involvement of palms, soles or oral cavity. Generalized rash was documented in 28 patients (46.7%) [Table - 1].

Table 2: Distribution of rash in hand, foot and mouth disease cases
Table 3: Type of rash in hand, foot and mouth disease cases
Figure 1: Erythematous macules in the palms in hand, foot and mouth disease

Thirty eight patients (63.3%) had features of atypical hand, foot and mouth disease [Table - 1], [Table - 2], [Table - 3] and [Figure - 2]a and [Figure - 2]b.

Figure 2

Detailed workup including polymerase chain reaction-based study of cerebrospinal fluid for viral infection was within normal limits in two patients who developed seizures, and febrile seizure was diagnosed in the above cases. All patients received symptomatic treatment. The two children who had seizures received clobazam as antiepileptic drug. Complete recovery in 7–10 days was recorded in each case.

This study reports co-circulation of Coxsackievirus A6 and Coxsackievirus A16, with Coxsackievirus A6 being the predominant cause of hand, foot and mouth disease in North Kerala during 2015–2016 which is in variance with the two previous studies from Kerala.[10],[11]

Our finding of Coxsackievirus A6 showing a predilection for children was consistent with other reports from Asia, but contrary to Western data.[1],[4],[12],[13],[14],[15] Though recurrence of hand, foot and mouth disease in the same season is reported earlier (attributed to infection with a different strain formed by genetic recombination), we cannot comment whether the three patients who gave history of previous hand, foot and mouth disease in our study suffered from same virus infection or not because the earlier diagnosis in these cases was not confirmed by virology workup.[16]

Rash sparing palms, soles and oral cavity as observed in some of our patients is reported earlier.[4],[5] The higher percentage of atypical hand, foot and mouth disease in this study could be attributed to the study being conducted in a tertiary care institution.[17]

Nearly one-third of the clinically suspected cases testing polymerase chain reaction negative for pan enterovirus could be due to delay in sample collection, inadequate material for virology workup, the failure to maintain the cold chain during viral transport and inability to detect a new or uncommon enterovirus RNA by the assay. Not collecting throat swab and stool sample in included cases would have contributed to the negative result.

Small sample size and lack of follow-up were the main limitations of our study. By conducting the study in a tertiary referral center, we were unable to gather information on the epidemiological aspects.

To conclude, absence of rash in hands, feet and mouth at the time of presentation does not rule out hand, foot and mouth disease. We recommend continuous monitoring to understand the changing patterns of hand, foot and mouth disease.

Declaration of patient consent

The authors certify that they have obtained all appropriate patient consent forms. In the form, the legal guardian has given his consent for images and other clinical information to be reported in the journal. The guardian understands that names and initials will not be published and due efforts will be made to conceal patient identity, but anonymity cannot be guaranteed.

This study was partially supported by the research grants of Dr. G. Arunkumar from Indian Council of Medical Research, New Delhi (No. 5/8/7/15/2010-ECD-I and No. VIR/NP/66/2013-ECD-I).

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

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