Human Immunodeficiency Virus (HIV) is one kind of virus and Acquired Immune Deficiency Syndrome (AIDS) is a killer diseases caused by HIV. It is continuous to be very common and complicated man killer diseases globally since it was first recognized in 1981 [1] . Once HIV starts damaging the immune system of human body, it ultimately transformed to AIDS and finally death [2] . The virus is generally transmitted through sexual contact, from infected women to their unborn children or through contaminated needles or blood [3] . Among the risk factors, sexual behavior is considered as the most significant predictor [4] -[6] . The disease AIDS has speared all over the world and the millions of people have been victimized by its prolong and sharp claw which leading to the largest causes of death in the world and placed fourth [7] -[9] . In 2012, almost 2.30 million people were HIV infected which was 3.50 million in 1990 [8] . Though the number of HIV infected people continues to fall but the actual number is quite significant. Around 35.50 million (Adults 32.10 million, women 17.70 million, children 3.30 million) people are currently living with HIV [8] . The total number of deaths due to AIDS is also quite significant. In 2012, total of 1.60 million deaths recorded due to AIDS [8] . The number of deaths is probably peaked in 2005 (2.30 million), and has declined only slightly. Globally, around 11.00% HIV infections were the babies who acquired this virus from their mothers and 17.80 million children were lost one or both parents to AIDS [10] . Furthermore, 10.00% were infected through the injecting drug use; 5.00% - 10.00% was due to the sex between men; and 5.00% - 10.00% occurred in health care setting [8] . The Sub-Saharan Africa is considered as the most affected area of HIV in the world [10] . Though this rate showed the decreasing trend in the present time and almost 40.00% drop between the years 2001 (2.6 million) to 2012 (1.6 million) but about one million fewer people acquired HIV in 2012 in the Sub-Saharan area [8] . In the Middle East and the North Africa, the number of HIV infected people rose by more than 50.00% and increased from 21,000 in 2001 to 32,000 in 2012 [11] . Again, in Caribbean nation about 50.00% HIV infection fell and 12,000 HIV infected patients in 2012 which was declined from 25,000 in 2001 [8] . In the South and the South-East Asia there were one-third decreased in the number of people living with HIV from 2001 to 2012 [11] .

Importantly the HIV epidemic in Asia is increased in the recent periods [11] . In the early to mid-1980’s, while others parts of the world were first beginning to deal with serious AIDS epidemic, Asia remained relatively unaffected by this newly discovered health problem. By the early 1990s, however, epidemic had emerged in several Asian countries and by the end of that decade; HIV is spreading rapidly in many areas of this continent [12] . In 2012, there were 81,000 HIV infected people in this continent which is rose from 68,000 in 2001 [13] . As in the Asian countries with its more than 150 million populations, Bangladesh is still fortunate to be a low prevalent country (<0.001%) for HIV/AIDS [14] . The first case of HIV in Bangladesh was detected in 1989. Until December 2012, there were 8000 reported cases of HIV and 1299 cases of AIDS, of which 472 deaths were officially recorded [14] . Bangladesh continues to be a low the prevalence country, but at present with high prevalence of risk behaviors and the effects of the western and Indian cultures, the country has lost its moral and traditional values which put it in more vulnerable situation. Moreover, higher prevalence of HIV/AIDS in the neighboring countries i.e. India and Myanmar put the country at high risk [15] . Again almost all of the risk factors that facilitate rapid transmission of HIV infection, such as a large number of hidden sex industry, lower levels of condom use, increasing injecting drug use and persistent sharing practices are presented here [14] [16] [17] . There were only forty establish prostitutions in Bangladesh but all the residential hotels (ranging from higher to low class) in the major cities are thriving on sex business and important studies of the sex industry identified about 1,70,000 professional sex workers whose customers are in all segments of the society [16] . The larger shares of the sex workers are illiterate and they do not have enough knowledge about HIV/AIDS, but they can handle about half a million men per day with an average of 2 - 5 clients a day [14] . We feel proud that we live in an Islamic conservative society and moral values are better compared to the other western countries. But the real scenario is quite unbelievable. In Islam, sex outside marriage, premarital sex, extramarital sex and male to male sex are strongly prohibited, but these types sexual practices is increasing tremendously particularly among youths. It is mentionable that, all of the recreational areas in Bangladesh especially in Dhaka city are considered as the venue of sex place just after evening. All of the situation will put Bangladesh in more vulnerable position. With the increasing of HIV prevalence, the different studies about knowledge and awareness have been performed in various sites [18] -[22] . Hasan et al., [18] documented that almost everyone (98.30%) heard the about HIV/AIDS and majorities (90.60%) knew that the disease is transmissible from person to person and mainly by sexual contact but only 28.20% had some idea about the sign and symptoms of HIV. Sarkar et al., [23] identified the vulnerable groups which have lower level of preventive knowledge and transmission routes and ways of avoiding HIV/AIDS. Goni and Rahman [24] were conducted a study among the blood donors in Rajshahi City of Bangladesh and identified that 89.00% blood donors reported that HIV is transmitted through blood transfusion and only 1.00% of them had undertaken blood test before donation. Mondal et al., [25] used Bangladesh Demographic and Health Survey (BDHS), 2007 data to assess the level of awareness about HIV/ AIDS among ever married women and concluded that the respondents’ education, husbands’ education, husbands’ occupation, age at marriage, watching television, electricity in the household, marital status and residence had statistically significant effects on HIV/AIDS awareness. However, studies on AIDS in the rural setting of Bangladesh are very scanty. Since HIV in not curable, it is very important to take the preventive measures. Therefore, the specific objective of this study is to find out the knowledge level about HIV/AIDS among the rural populations in Bangladesh.

In this study, data were collected from a total number of 100 villagers of Salmanpur from Comilla district, Bangladesh during 15-17 February, 2010. Respondents were interviewed using a standard questionnaire through purposive sampling technique. Both univariate and bivariate analyses have been performed to analyze the collected data. Firstly, univariate analysis was used to explore the background characteristics of the respondents, and later attempts were made to measure the knowledge level of the villagers regarding HIV/AIDS. In order to measure the knowledge level of HIV/AIDS, villagers were asked 13 different questions to respond either “yes” or “no”. Each correct response (yes) was coded as 1, while incorrect response (no) was coded as 0. Then total score were found by summing all the individual scores and finally mean value of this scores were used in this analysis as the level of knowledge about HIV/AIDS, where mean values were obtained by dividing total score by 13 for each respondent. To justify the total score for knowledge about HIV/AIDS, Cronbach’s alpha (α) was calculated, which was 0.789, suggested that inter-correlations among knowledge items were strong enough to use them as a single combined variable. The mean values of knowledge on AIDS range from 0.00 - 1.00. The mean values were divided into three quartile, denoting the mean values 0.00 - 0.33 as very few knowledge, 0.34 - 0.66 as medium knowledge and 0.67 - 1.00 as enough knowledge.

The HIV/AIDS epidemic has become one of the burning health issues across the world. HIV/AIDS awareness in Bangladesh has long been a topic of interest in research including all sectors of population because it has a direct relation with the prevalence of HIV/AIDS. The prevalence of HIV/AIDS is believed to be low in Bangladesh until now though the infection rate is increasing day by day and experts have classified the AIDS situation as concentrated epidemic. In the recent time, due to the urbanization and modernization our traditional family system breakup and our youth generation follow the western culture than the previous times. Along with the geographical location where Bangladesh is surrounded by the two higher HIV prevalence country (India and Myanmar), this put the Bangladesh is more vulnerable situation. Although poor medical facilities, lack of sufficient screening practice, unsafe sexual practice among the risk groups of population segment and the low level of knowledge and awareness about HIV/AIDS increasing the chance of more HIV infection. Compared to the other countries, Bangladeshi populations are more known about HIV/AIDS but possible causes of AIDS are fully undefined to them [18] [26] -[30] ). The present study suggested that, about 92.00% of the respondents were heard about HIV/AIDS which was 90.00% among Nepalese and 85.00% among Cambodian and only 41.00% in India [30] . These findings strongly suggested that, it is needed to increase the current level of specific knowledge

about HIV/AIDS. It is possible by adding the HIV/AIDS related lessons in the secondary level and telecast broadly via the mass media. The results also showed that, married and young adolescents have the better knowledge than their unmarried and older counterparts. This might be due to the fact that the younger and married adolescents are more sexually active than that of other family members. So, it is necessary to aware about HIV/AIDS about all segments of the populations by giving the equal important. Level of education is an important factor which was also significantly associated with the level of knowledge and awareness of the HIV/AIDS. The present study is consistent with the previous study findings [23] [31] . In fact, education is the way of communication for any message. So, the community based health related educational programs should be strengthened through mass media, for which the general population will be gathered correct information about various epidemics especially HIV/AIDS.

Knowledge and awareness of HIV/AIDS infection among rural populations has a great importance in case of reducing and controlling this epidemic. Realizing these issues, especially in Bangladesh, the present study was conducted. We have collected information from 100 villagers among of them 46.00% are males and 54.00% are females. Among them, a few respondents were higher educated. Majority of the respondents ever heard about HIV/AIDS but half of them were reported that it was a communicable disease. More than half of the villagers believe that AIDS causes due to the sexual relations with many men and women but a good number of the respondents are unaware about the other causes of HIV/AIDS. Most of the respondents have the medium knowledge about HIV/AIDS and only one-third of the respondents have the enough knowledge. Around half portion of male, and young and middle aged villagers do not have enough knowledge about HIV/AIDS. Educated respondents were found more aware about the transmission of HIV. So education should be enhanced to the general people particularly for females. In the formal educational system especially in primary and secondary levels of education, topic about basic health should be included. Information should be provided to create knowledge and awareness about HIV/AIDS through health workers, doctors, teachers, and mass media among the general population. Special arrangement should be made to spread the knowledge on correct use of condoms including condom demonstration among people and especially among the couples. More comprehensive research is needed to the better understanding of the factors relevant to the development of risk reduction interventions.

The authors are very grateful to the respondents who were provided their valuable time and opinion about HIV/ AIDS to perform the study. The authors gratefully acknowledge the extreme co-operation received from the authority of Bangladesh Academy of Rural Development (BARD), Comilla to make a chance to conduct this study.

The authors declare that they have no competing interests.

All authors have contributed to the conceptualization, conduct, and analysis of this research, and all authors have participated in the manuscript drafting, editing, and revising. All authors have approved the final version of this manuscript.