The recent sightings of Russell's vipers in rural areas and urban outskirts of Bangladesh have led to increased fear among the public. Widespread rumours have further led to misinformation, misguiding people and causing panic. To address this, it is crucial to evaluate facts about the snake, ensuring communities are better prepared to handle abrupt encounters. Let's go over facts, myths, and the origin of Russell's viper. Introducing Russell's Viper This venomous snake, known scientifically as ‘Daboia russelii’, belongs to the family Viperidae. The species was named in honor of Patrick Russell, a Scottish herpetologist renowned for his pioneering descriptions of many snakes native to India. The genus name, ‘Daboia’, is derived from a Hindi word meaning ‘that lies hid’ or ‘the lurker’. However, recent studies have reclassified these South Asian snakes as a separate species, ‘Daboia siamensis’. The type locality is specifically listed as Coromandel Coast, India, as inferred by Russell in 1796. This southeastern coastal region of the Indian subcontinent borders the Bay of Bengal, where Bangladesh is also located. In Bangladesh, the snake is known as ‘Chandrabora’. Originally, this viper was primarily found in the Barendra region of Bangladesh. However, its range has expanded significantly to include areas along the banks of the Padma, Meghna, and Jamuna rivers. The spread of this snake has caused widespread panic in numerous regions, including Barishal, Patuakhali, Manikganj, Faridpur, Shariatpur, Chandpur, and even villages on the outskirts of Dhaka. Presently, this venomous reptile is reported in at least 25 districts across Bangladesh. Read more: Locals rush to catch Russell’s vipers after bounty announcement by Faridpur AL leader Russell's Viper: Myth vs. Reality False information regarding this viper has been spreading across social media platforms, causing extensive public panic in Bangladesh. These misleading posts have generated significant misconceptions about the snake and its prevalence. However, the facts differ greatly from these rumors. Let's explore the most popular myths and the truths behind them. Native or Non-native to Bangladesh? Contrary to popular belief, Russell’s viper is native to Bangladesh as well as other countries in Southeast Asia. It was initially described in 1797 by English naturalist George Shaw and illustrator Frederick Polydore Nodder. According to the article ‘Russell's Viper (Daboia russelii) in Bangladesh: Its Boom and Threat to Human Life’, of the Asiatic Society of Bangladesh Science in 2018, two species of these snakes exist globally. Daboia Russelii is found in India, Pakistan, Nepal, Sri Lanka, Bhutan, and Bangladesh, whereas Daboia siamensis inhabits China, Thailand, Myanmar, Indonesia, Cambodia, and Taiwan. The species was classified as 'critically endangered' in 2000 and remained 'near-threatened' at least until 2015 in Bangladesh by the International Union for Conservation of Nature. Read more: What to do when you encounter a Russell's Viper: Environment Ministry issues guidelines Chasing People to Bite? In 2021, Mongabay published a research paper titled ‘Tracking Russell's viper in rural Karnataka unravels their behavior’, authored by organismal biologist Xavier Glaudas. Throughout his study, Glaudas had numerous close encounters with these vipers, yet remarkably, he was never bitten. He attributed this to the snake's tendency to remain concealed within vegetation. These vipers typically exhibit immobility when approached, occasionally retreating deeper into foliage or retracting their heads for camouflage.

Dengue, often referred to as break-bone fever, poses a considerable risk. The world has witnessed its spread as an epidemic, affecting millions globally. Amid this global health concern, some myths surrounding dengue are leading to misinformation and misguided treatment approaches. This article is going to debunk 10 myths about dengue. Let’s clear up these misconceptions about this formidable mosquito-borne disease for effective prevention. 10 Misconceptions about Dengue Dengue is Contagious Dengue primarily spreads through the bite of infected Aedes mosquitoes. It is not a contagious disease. It is not transmitted through person to person contacts. While dengue is not typically transmitted from person to person, there are exceptional circumstances to consider. For instance, an infected pregnant mother can pass the virus to her developing fetus. Additionally, transmission via blood products, organ donation, and transfusions, while extremely rare, is not entirely impossible. Read more: Exploring Dengue Diagnosis: The Essential Tests for Detecting the Virus Dengue Prevails in Rural or Developing Areas This myth does not hold when examining the global reach of this infectious disease. Dengue is not limited to any specific geographical or economic boundaries. Dengue can occur in any country where the Aedes mosquito species are present. This includes tropical and sub-tropical climates worldwide, encompassing both urban and semi-urban areas. Children and Elderly Are Susceptible to Dengue It's crucial to clarify that dengue can affect individuals of all ages, regardless of their age, gender, or socioeconomic status. Dengue virus does not discriminate based on age. People of all age groups are susceptible to dengue infection, and this includes infants, children, teenagers, and adults. It's true that certain risk categories, such as children and the elderly, are more vulnerable due to their potentially weakened immune systems. However, even healthy individuals can contract dengue or develop severe symptoms. Read more: Dengue Fever: Symptoms, diagnosis, treatment, prevention Any Mosquito Can Carry Dengue Virus In reality, dengue can only be transmitted through the bite of a female mosquito belonging to the Aedes Aegypti or the Aedes Albopictus species. This certain species is distinguished by its characteristic white markings on the legs. The transmission occurs when it bites an infected individual and subsequently bites a healthy and non-infected person. After an incubation period of about a week, the same mosquito can transmit the disease to another individual. It makes these particular mosquito species the primary vectors for dengue transmission. Dengue Mosquitoes Only Bite During the Day While it is true that dengue-spreading mosquitoes are more active during the daytime, their feeding habits can extend into nighttime hours. These mosquitoes are typically most active around two hours after sunrise and a few hours before sunset. However, they have been observed biting people at night, particularly in well-lit areas. One of the risk factors for nighttime exposure to dengue mosquitoes is the presence of artificial lighting. These mosquitoes can be drawn to indoor environments, including offices, malls, indoor auditoriums, and stadiums that use artificial lights throughout the day and night. Read more: How to Protect Babies and Children from Dengue Fever