The global challenge of HIV/AIDS remains one of the most pressing public health issues today. According to the latest data from UNAIDS, around 38.4 million people worldwide are living with HIV/AIDS, underlining the need for not only medical intervention but also comprehensive awareness, education, and social change. Despite the significant strides made in treatment and prevention, the confusion surrounding the relationship between HIV and AIDS still persists.

Young people have become influential advocates in the fight against HIV/AIDS. Research from UNICEF shows that youth-led initiatives can lower HIV transmission rates by as much as 45% in targeted communities. These young activists utilize digital platforms and peer-to-peer education to dispel myths, promote safe practices, and foster supportive environments for those affected by HIV/AIDS.

Dr Gowri Kulkarni, an expert in Internal Medicine, explains that while the terms HIV and AIDS are often used interchangeably, they are distinctly different. "HIV (Human Immunodeficiency Virus) is a virus that attacks the immune system, whereas AIDS (Acquired Immunodeficiency Syndrome) is a condition that occurs when HIV severely damages the immune system," she clarifies. To understand the implications of these differences, it's important to explore the fundamental distinctions between the two.

1. HIV is a Virus; AIDS is a Syndrome

HIV is the virus responsible for attacking the body’s immune system, specifically targeting CD4 cells, which are crucial for the body’s defense against infections. As HIV progresses, it destroys these cells, weakening the immune system over time. If left untreated, this continuous damage can lead to AIDS.

AIDS, on the other hand, is a syndrome, not a virus. Dr Kulkarni further elaborates that AIDS is a collection of symptoms and illnesses that emerge when the immune system is severely compromised due to prolonged HIV infection. It represents the most advanced stage of HIV, and is characterized by very low CD4 counts or the onset of opportunistic infections like tuberculosis, pneumonia, or certain cancers.

2. Not Everyone with HIV Develops AIDS

A key distinction to remember is that not everyone with HIV will progress to AIDS. Thanks to advancements in medicine, particularly antiretroviral therapy (ART), individuals living with HIV can manage the virus and maintain a healthy immune system for many years, or even decades, without ever developing AIDS. ART works by suppressing the virus to undetectable levels, effectively preventing the damage HIV would otherwise cause to the immune system.

Without treatment, however, HIV progresses through three stages:

- Acute HIV Infection: This stage occurs shortly after transmission and may include symptoms like fever, fatigue, and swollen lymph nodes.

- Chronic HIV Infection: Often asymptomatic or mildly symptomatic, the virus continues to damage the immune system but at a slower rate.

- AIDS: This is the final stage, marked by severe immune damage and the presence of infections that take advantage of the compromised immune defenses.

3. HIV is Transmissible; AIDS is Not

Another key distinction between HIV and AIDS is the way in which they are transmitted. HIV is highly contagious and can be transmitted through the exchange of bodily fluids such as blood, semen, vaginal fluids, and breast milk. It is primarily spread through unprotected sexual contact, sharing needles, or from mother to child during childbirth or breastfeeding.

AIDS, however, is not transmissible. It is not a disease that can be passed from one person to another. Rather, AIDS is the result of untreated, advanced HIV infection and is a direct consequence of the virus’s damage to the immune system.

4. Diagnosis Methods Differ

HIV and AIDS are diagnosed through different methods. HIV is diagnosed through blood tests or oral swabs that detect the presence of the virus or antibodies produced by the immune system in response to the virus. Early detection of HIV is crucial, as it allows for timely intervention and treatment, which can prevent the virus from progressing to AIDS.

AIDS, on the other hand, is diagnosed using more specific criteria. Dr Kulkarni notes that the diagnosis of AIDS is made when the individual’s CD4 cell count falls below 200 cells/mm³, or when opportunistic infections or certain cancers (such as Kaposi's sarcoma or lymphoma) are detected. Diagnosing AIDS involves a more thorough assessment of the individual’s immune function and overall health, as opposed to just the detection of HIV.

5. Treatment Goals Are Different

The treatment goals for HIV and AIDS differ significantly, although both involve antiretroviral therapy (ART). For HIV, the primary treatment goal is to suppress the virus to undetectable levels, thus maintaining a strong immune system and preventing further transmission of the virus. People living with HIV can often live long, healthy lives if they adhere to ART.

For individuals diagnosed with AIDS, the treatment plan becomes more complex. While ART remains an essential part of managing the virus, treatment for AIDS also focuses on addressing the opportunistic infections and secondary health complications associated with severe immune suppression. The goal of treatment for AIDS is not only to manage the HIV virus but also to improve the quality of life and extend survival by treating these secondary health issues.

Role of Community Engagement in Combatting HIV/AIDS

While the medical community has made great strides in managing HIV, the battle to curb its transmission is also a social and cultural issue. Dr Daman Ahuja, a public health expert, highlights that HIV/AIDS awareness and education are vital to reducing transmission rates and supporting those affected by the virus. "Young people, especially, have become key advocates in the fight against HIV/AIDS," says Dr Ahuja. "Research from UNICEF shows that youth-led initiatives can lower HIV transmission rates by as much as 45% in targeted communities."

Additionally, grassroots activism plays a significant role in raising awareness and addressing stigma. As the World Health Organization reports, community-based interventions have been proven to increase HIV testing rates and improve treatment adherence, which are crucial in the fight against the pandemic.

The ultimate goal of organizations like UNAIDS is to eliminate the HIV/AIDS pandemic by 2030. Achieving this requires global collaboration, from medical treatment advancements to public health strategies, education, and advocacy. Dr Kulkarni’s insight underscores the importance of early detection, treatment adherence, and community support in the fight against HIV/AIDS.

Dr Gowri Kulkarni is Head of Medical Operations at MediBuddy and Dr Daman Ahuja, a public health expert and has been associated with Red Ribbon Express Project of NACO between 2007-12.

With advancements in medical technology, hip replacement surgery has evolved significantly over the years. One of the most promising innovations in this field is the Direct Anterior Approach (DAA) Total Hip Replacement, a modern technique that offers patients a safer procedure, reduced pain, and faster recovery.

Unlike traditional hip replacement surgeries, the DAA technique allows surgeons to access the hip joint from the front through a small incision. The biggest advantage of this approach is that muscles are not cut during the surgery. Instead, they are gently separated, which helps minimize tissue damage and reduces post-operative pain considerably.

This muscle-sparing approach has transformed patient recovery experiences. Most patients are able to stand and walk on the same day of surgery, and hospital stays are generally shorter. Recovery is smoother, allowing individuals to return to their normal routine within three to four weeks in most cases.

The DAA technique is especially beneficial for patients suffering from chronic hip pain, restricted movement, or severe joint damage. Common conditions that may require hip replacement include osteoarthritis, avascular necrosis (AVN), rheumatoid arthritis, old hip fractures, and long-standing degenerative joint conditions. When medications, physiotherapy, and injections fail to provide lasting relief, hip replacement surgery can significantly improve mobility and quality of life.

Compared to conventional hip replacement procedures, DAA offers several advantages. The surgery involves a smaller incision, less blood loss, minimal muscle damage, and lower post-surgical discomfort. Patients are able to regain movement faster and often experience greater confidence during rehabilitation.

One of the most common concerns among patients is the fear of severe pain after surgery. However, with modern pain management techniques and advanced surgical methods, discomfort after DAA hip replacement is usually minimal and manageable. Patients today recover much more comfortably than they did in the past.

Another important factor is the durability of modern implants. Advances in implant technology have significantly improved their lifespan, with many implants lasting more than 25 years. Maintaining a healthy body weight, staying physically active, and following medical advice can further improve the longevity and effectiveness of the implant.

After successful recovery, patients are generally able to resume a normal and active lifestyle. They can return to work, perform household activities independently, and participate in light exercises such as yoga, swimming, and stationary cycling. The primary goal of hip replacement surgery is not just pain relief, but restoring confidence, mobility, and independence.

Preparation before surgery also plays an important role in achieving better outcomes. Patients are advised to maintain controlled blood sugar levels, blood pressure, and overall heart health. Informing doctors about ongoing medications, performing basic physiotherapy exercises before surgery, and preparing a comfortable recovery environment at home can contribute to a smoother rehabilitation process.

Hip pain should never be ignored, especially when it begins affecting daily life and mobility. Timely treatment and the right surgical approach can make a remarkable difference. The Direct Anterior Approach has made hip replacement surgery simpler, safer, and more patient-friendly, helping individuals return to an active and pain-free life much faster than before.

Dr. Ishwar Bohra is Senior Director and Senior Joint Replacement Surgeon at BLK-Max Super Speciality Hospital, New Delhi.

Climate change is increasingly emerging as a major public health threat, contributing to a growing burden of disease worldwide and creating favorable conditions for the spread of infectious illnesses, according to health experts on World Environment Day 2026.

World Environment Day is observed every year on June 5 to raise awareness about the need for immediate action as heatwaves intensify, air pollution worsens, ecosystems degrade, and climate anxiety grows worldwide, even as the world crosses the UN-mandated 1.5°C limit.

The theme for World Environment Day 2026 is "Inspired by Nature. For Climate. For Our Future". It focuses on climate change and the signals nature is sending such as rising seas, raging wildfires, heatwaves and melting glaciers.

To understand the intersection between climate change and health impacts, HealthandMe spoke to two experts.

Heatwaves, Pollution And Food Insecurity

According to Dr. Sabine Kapasi, UN advisor, the consequences are no longer limited to environmental damage. Rising temperatures, worsening air pollution and shifting weather patterns are already affecting human health across the globe.

“Longer and more intense heatwaves are resulting in more cases of heat-related illness. Air pollution continues to exacerbate respiratory diseases, while changing weather patterns are impacting food security and nutrition in many parts of the world,” she said.

Importantly, in India, children, pregnant women and communities living in flood- and drought-prone regions face some of the greatest risks. Women are often disproportionately affected due to challenges related to water supply and sanitation. While India has reduced malaria cases by nearly 80 per cent since 2015, climate change is creating new health challenges that health systems will need to address in the coming years.

Infectious Disease Outbreaks

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The expert warned that changing climatic conditions are also increasing the risk of infectious disease outbreaks. Dr. Kapasi told HealthandMe that rising temperatures and altered rainfall patterns are allowing mosquitoes to breed more easily and remain active for longer periods.

Floods further compound the problem by contaminating drinking water, damaging sanitation systems and disrupting healthcare services. Displacement caused by disasters can force families into crowded living conditions, increasing the risk of infections such as cholera, leptospirosis and tuberculosis.

“Recent climate-related disasters in South Asia and Africa have shown how quickly an environmental crisis can turn into a public health challenge,” she noted.

The spread of mosquito-borne diseases such as dengue, malaria and chikungunya is also becoming a growing concern. Health authorities around the world are reporting these diseases in areas where they were previously uncommon.

Globally, countries including Italy, France and Spain have also witnessed an increase in locally transmitted dengue and chikungunya cases over the past decade. In the United States, locally acquired malaria cases were recently reported in Florida and Texas, marking the first such transmission in nearly 20 years.

India is also experiencing rising dengue activity. Dengue outbreaks have become a regular occurrence during the monsoon and post-monsoon seasons in many states. Estimates suggest dengue cases could reach around 278,000 in 2025, up from roughly 230,000 the previous year. Experts say warmer temperatures and changing rainfall patterns are helping disease-carrying mosquitoes survive and spread more effectively.

Climate Change And Shifting Disease Patterns

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Dr. Devarsetty Praveen, Program Director at NIHR GHRC for Non-communicable Diseases and Environmental Change, hosted by The George Institute India, in partnership with Imperial College London, said climate change is affecting both communicable and non-communicable diseases.

“Climate change is increasing health risks through rising temperatures, extreme weather events, worsening air quality and changing disease patterns. In India, it is affecting both communicable and non-communicable diseases, with vulnerable populations bearing the greatest burden,” he told HealthandMe.

He noted that research has found that people living with chronic conditions such as hypertension and diabetes are particularly vulnerable to extreme heat, underscoring the growing link between climate change and non-communicable diseases.

Dr. Praveen added that climate change influences disease transmission by altering temperature, humidity and rainfall patterns while also affecting water quality, food systems and interactions between humans, animals and disease vectors.

“These changes can make outbreaks more frequent, more widespread and harder to predict,” he said.

How To Reduce Climate-related Health Risks

To reduce climate-related health risks, the experts recommend staying informed about weather conditions, remaining hydrated, limiting outdoor exposure during extreme heat and taking precautions against mosquito bites.

People with chronic conditions such as hypertension, diabetes, heart disease and kidney disease are advised to maintain adequate medication supplies and consult healthcare providers during periods of extreme heat.

According to the experts, awareness and early action remain critical to protecting public health as climate change continues to reshape disease patterns around the world.

To reduce the risk of mosquito-borne diseases, people should make sure that water does not get collected in buckets, coolers, flower pots or other containers around the home. Additional precautions include the use of mosquito repellents, sleeping under nets when necessary and wearing clothing that covers the arms and legs.

Dr Sabine said food and water safety is particularly important after heavy rain or flooding. Proper food storage, clean drinking water and good hygiene practices can go a long way in preventing many infections. Those with pre-existing medical conditions should also have essential medicines within easy reach during extreme weather.

The United States has been working on reducing smog for more than a decade and has become quite successful in this endeavor, but since 2015, the situation has changed for the worse as a new study reveals that the smog level is once again on the rise, and the main reason behind this is another long-term problem of the nation, wildfire.

The federal regulations tightened on power plants, cars, and diesel engines, which in turn caused a drop in the national smog level by 11% from 2003 to 2015. Since then, cases of wildfire have increased, resulting in the smog level going up by 4%. The study finds that if the current trend continues, it will cause smog to go back up to 2003 levels in 20 years.

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The study in the journal Science has also calculated a surge in deaths from ozone attacking lungs by comparing death rates in clean and dirty air. They estimated a surge of 318 American deaths per year since 2013 due to smog.

The co-author of the study, Meng Zhou, a University of Iowa wildfire researcher, said, “For the last 20 years, by regulations, we keep decreasing the emissions." He added, “However, because of wildfires, which are actually from natural hazards, all those kinds of effort were wiped out.”

The study also flagged concerns about the current smog situation and its possible impact on the population. University of Washington public health and climate scientist Kristie Ebi said, “Higher daily ozone concentrations can increase asthma attacks, hospital admissions, and mortality.” She added, “still a very important pollutant, which is why it's regulated.”

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The research finds that the heavy wildfire smoke seasons of 2022, 2023, and 2024, mainly in Canada, created a massive amount of smog, and this then came down south. As a result, about 43 million people got exposed to smog levels that exceeded the current EPA safety standards. The wildfires in Canada have been particularly severe since 2022.

The problem is also with the massive wildfires in the mainland US, as the National Interagency Fire Center's data also shows that the average amount of land in the US that wildfires burn every year has increased by 9% higher than it was from 2003 to 2014.

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What Are The Possible Health Impacts?

There are many short-term and long-term impacts on public health from the constant exposure to air pollution. As per IQAir, in the short term, people experience irritation in the eyes, throat, and nose, along with irregular heartbeats, asthma attacks, coughing, chest tightness, and difficulty breathing.

Prolonged exposure also intensifies these risks and leads to long-term effects such as chronic respiratory illnesses like bronchitis, asthma, and emphysema. Pollutants can also damage lung tissue, increasing the likelihood of lung cancer. Air pollution also leads to an increased risk of heart attacks and strokes, and could also be linked to premature death.