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Study of clinico-epidemiological profile of leprosy patients at tertiary care centre of South Gujarat region

Leprosy is a chronic disease caused by Mycobacterium leprae, infectious in some cases, and affecting the peripheral nervous system, the skin, and certain other tissues. It has been a feared illness since antiquity, due to the havoc it wreaks upon the body. Leprosy has a wide distribution in the world, but most prevalent in the tropical and subtropical regions. Humans who are the most likely source of infection for other humans, or for susceptible animals, are those who harbour M. leprae in the upper respiratory tract, especially in the nose, and these probably constitute about 20% of all leprosy suffers. Danger is from undiagnosed case. Bad housing conditions and inadequate food are important factors in the spread of leprosy for domestic overcrowding particularly at night, provides the ideal conditions for infection whether by droplets or by skin contact and under-nourishment reduces cell-mediated immunity. Campaigns to control leprosy in endemic regions should take these factors into account. Leprosy preferentially infects cooler parts of the body, particularly the fingers, toes, eyes, nose and testes. The response of the immune system to the infection often leads to an intense inflammation, and in the involved nerve, it causes severe damage, leading to peripheral neuropathy. Leprosy is not often a direct killer. Instead, due to the predilection of the infective agent for skin and peripheral nerves, the serious but fortunately not very common consequences of leprosy are deformity and disability. This has significant ABSTRACT


INTRODUCTION
Leprosy is a chronic disease caused by Mycobacterium leprae, infectious in some cases, and affecting the peripheral nervous system, the skin, and certain other tissues. It has been a feared illness since antiquity, due to the havoc it wreaks upon the body. Leprosy has a wide distribution in the world, but most prevalent in the tropical and subtropical regions. Humans who are the most likely source of infection for other humans, or for susceptible animals, are those who harbour M. leprae in the upper respiratory tract, especially in the nose, and these probably constitute about 20% of all leprosy suffers. Danger is from undiagnosed case. Bad housing conditions and inadequate food are important factors in the spread of leprosy for domestic overcrowding particularly at night, provides the ideal conditions for infection whether by droplets or by skin contact and under-nourishment reduces cell-mediated immunity. Campaigns to control leprosy in endemic regions should take these factors into account. Leprosy preferentially infects cooler parts of the body, particularly the fingers, toes, eyes, nose and testes. The response of the immune system to the infection often leads to an intense inflammation, and in the involved nerve, it causes severe damage, leading to peripheral neuropathy. Leprosy is not often a direct killer. Instead, due to the predilection of the infective agent for skin and peripheral nerves, the serious but fortunately not very common consequences of leprosy are deformity and disability. This has significant Introduction of multidrug therapy (MDT) to leprosy programmes in the mid 1980's resulted in significant reduction in prevalence of the disease, from 5.4 million cases to a few thousand cases per year at present. With the help of national leprosy eradication programme (NLEP) India had achieved elimination targets in 2005, the criteria being less than 1 case per 10000 population. However, majority of leprosy burden in the world still comes from south east Asian region (SEAR) particularly from India; around 60% of the new leprosy cases detected globally in 2015 were from India (WHO 2015

METHODS
After taking Institutional ethical committee permission retrospective record-based study was conducted in the leprosy clinic of department of dermatology, venereology and leprosy of Surat Municipal Institute of Medical Education and Research, Surat, Gujarat, India. Records of patients visiting the leprosy clinic for duration of 5 years from January 2014 to December 2018 were retrieved. The study included all the cases of leprosy with completely filled standardized pre-designed proformas during that study period. Incompletely filled proformas were excluded from the study. Records of the patients were analysed for the parameters like age, sex, region, number of patients from different states within country, extent of skin and nerve involvement, bacillary load [multibacillary (MB) and paucibacillary (PB) cases], type of lepra reaction, patients presenting and grade of disability as per WHO criteria (Brandsma and van Brakel 2003) etc. Patients were classified into clinical spectrum as per classification of Ridley-Jopling (1966) and Indian Association of Leprologists (IAL 1982). The data so collected was tabulated and analysed statistically.

RESULTS
Retrospective analysis was done. A total of 307 patients attended the leprosy clinic in tertiary health care centre of South-Gujarat during January 2014 to December 2018. Out of them, there were 213 males and 94 females with male to female ratio of 2.3:1. Out of total 307, majority of patients (185-that is 60.3%) belonged to age group of 21-40 years with age range of 6 to 81 years (  (Figure 1, shows state wise distribution of migrants).
There were total 16 childhood leprosy cases (less than 14 years of age). Among them, most common type was Tuberculoid leprosy which was 7 in number, followed by Borderline tuberculoid leprosy which was 4 in number (Table 3).
It was observed that there was steady increase in number of leprosy patients every year from 2014 to 2018 (except for year 2016).
Total number of patients suffering from lepra reaction was 31 (10.1%) out of which type 2 reaction was seen in 23 (7.5%) patients while type-1 was noted in 8 (2.6%) patients. Among 23 patients of type 2 reaction, most of the patients (22) were of lepromatous leprosy while 1 patient was of borderline lepromatous leprosy. Type 1 reaction was seen in 4 patients of borderline tuberculoid leprosy and 4 patients of borderline lepromatous leprosy ( Figure 3). At the time of presentation, 156 (50.8%) patients out of 307 patients were presented with sensory deformity while 74 (24.1%) patients were presented with motor deformity ( Figure 4). Only 15 (almost 5%) patients-all of lepromatous leprosy were having different types of eye deformity (Table 4).
Nerve thickening was present in 146 (44.6%) patients in whom ulnar nerve was most commonly involved followed by lateral popliteal, radial cutaneous, and posterior tibial nerves. Neuritis was noticed in 102 (33.2%) patients out of which 3 patients presented with type 1 reaction and 8 patients presented with type 2 reaction.        The implementation of MDT programme by itself has helped in improving case management in such a way that a substantial reduction in prevalence has been achieved in all leprosy endemic countries/states. Despite of noticeable decrease in prevalence rate (PR), the annual new case detection rate (ANCDR) has not declined so steeply. So overall reduction in leprosy cases are there in post MDT era. Situation of leprosy 2014 to 2018 has been mentioned in Table 5.
The latest update from the WHO titled 'global leprosy update, 2016: accelerating reduction of disease burden:' states that-although there has been a significant reduction in prevalence of the disease worldwide since the mid-1980s to elimination levels, new cases continue to arise indicating continued transmission. 2 The global prevalence at the end of 2016 was 171,948 with a registered prevalence rate of 0.23 per 10,000 population, a decrease from that in 2015. Most common type of leprosy found in our study was Borderline tuberculoid leprosy with 83 patients (27.1%), followed by lepromatous leprosy (24.7%) and tuberculoid leprosy (24.7%), Pure neuritic leprosy 33 (10.8%), Borderline lepromatous leprosy 32 (10.7%), indeterminate leprosy 4 (1.3%), histoid leprosy 3 (1%). and mid borderline leprosy with 2 patients (0.7%).
BT was to be the most common spectrum followed by BB in other studies also ( Numbers of patients suffering from lepra reactions were 31 (10.1%) in which type 2 reaction was seen in 23 (7.5%) patients while type-1 was seen in 8 (2.6%) patients in present study.
Out of 23 patients of type 2 reaction, majority patients were having lepromatous leprosy (22 patients). While in 8 patients of type 1 reaction, half (4) were having borderline tuberculoid leprosy and another half (4) were having borderline lepromatous type of leprosy.
Similar findings of lepra reactions were noted in the study done by Adil et al, 12.9% patients (29) were having lepra reactions among which 3.1% (7) were of type 1 and 9.8% (22) patients were of type 2 lepra reactions respectively.
In Tegta at al study, lepromatous leprosy (32.1%) and borderline lepromatous (31.2%) were common types of leprosy. 8 Total number of patients suffering from lepra reactions were 82 (37%) in number in which type 2 reaction was seen in 46 (20.8%) while type 1 reaction in 36 (16.3%) patients. Among type 1 reaction patients, borderline tuberculoid type of leprosy was most common and in type 2 reaction, borderline lepromatous type of leprosy was most common. 8 Jindal et al also noted that borderline tuberculoid leprosy was more common in type 1 reaction and lepromatous leprosy was common in type 2 reaction patients. 7 18% patients of lepra reactions were recorded in study done by Agrawal et al. 12 Histoid leprosy was reported in 1% (3 patients) only. Similar proportion was reported by Kaur et al (1.8%) (2009). 13 The proportion of new child cases globally is 8.8% (WHO, global leprosy update 2015). 9 In our study, childhood leprosy cases (≤14 years of age) were found in 5.2% (16) patients. The proportion is lower than reported by Chhabra et al (2015) (9.3%). 14 Singal et al (2011) also noted somewhat higher proportion of leprosy cases in children (9.6%). 15 In present study eye deformity was noted in total 15 patients (almost 5%) which was comparable with the study done by Jindal et al who noted eye deformities n 5.5% patients. 7 Tegta et al noted eye deformity in 8.6% of patients. 8 In our study most common eye deformity was lagophthalmos and in Tegta et al study conjunctivitis was most common. In both studies corneal ulcer and blindness were rare manifestations with o and 1 number respectively. 8 In our study total 230 (74.91%) patients were having sensory and/or motor deformity, while in Tegta et al study total 175 (79.2%) patients were having deformity [8] . In our study grade 1 and grade 2 deformity patients are 156 (50.8%) and 74 (24.1%) respectively. Tegta et al reported 79 (35.7%) patients of grade 1 and 77 (34.8%) patients of grade 2 deformities respectively. 8  Higher grade II disabilities indicate the need to improve the access to quality services so that patients are diagnosed and treated early and disabilities are prevented.
Nerve thickening was found in 44.6% (146) patients and neuritis in 33.2% patients in our study. Ulnar nerve was the most common to be involved. Similar finding of predominant ulnar nerve involvement was noted by the study done by Tegta et al, Patil et al and Lasry et al. 8,16,17

CONCLUSION
In spite of decline in leprosy cases globally and at national level, there is steady increase noted in our study. Gujarat, a low endemic area for leprosy, is too getting its share of migrant leprosy as is evident from the data from our study. Large number of migrant populations from high endemic areas especially Uttar Pradesh, Bihar, and Maharashtra travelling to Gujarat for seeking employment opportunities may be the reason for this. The rate of MB case (72.31%) as well as a proportion of patients presenting with grade II disability (24.1%) is also a matter of concern. The most important factor that could have significant impact on prevalence is the coverage of the entire population with adequate MDT service. This shows the need to increase the awareness in community as well as health care workers so that cases report early, are diagnosed early and are managed appropriately on time so that chances of disabilities can be reduced. Our study has some limitations as it was conducted in a tertiary care hospital, and was done by retrospective data analysis based on departmental records. So, it cannot be the representative of the situation on the field. Still, it gives a general picture about the current trends of leprosy in the region. But there is requirement to carry out population-based studies for better understanding of the situation in community and for better management of patients.