Hepatitis B and C: Transmission, Testing, and Treatment Advances

Many people still think hepatitis B and C are the same thing. They’re not. Hepatitis B is preventable with a vaccine. Hepatitis C can be cured - but only if you know you have it. Both viruses attack the liver, but they spread differently, test differently, and are treated in completely different ways. And right now, we’re at a turning point: we have the tools to stop both, but millions still don’t get tested, don’t get treated, or don’t even know they’re at risk.

How Hepatitis B and C Spread - And What Doesn’t Spread Them

Hepatitis B is one of the most contagious viruses on Earth. It’s 100 times more infectious than HIV. You can catch it from blood, semen, vaginal fluids, or even saliva if it enters your bloodstream. That means childbirth is a major route - in places like parts of Asia and Africa, up to 90% of chronic infections come from mothers passing it to newborns during delivery. It’s also spread through sex, especially if you have multiple partners or don’t use protection. Sharing needles, razors, or toothbrushes can do it too. The virus can live outside the body for up to seven days, which is why it’s a big problem in prisons, dialysis centers, and among healthcare workers.

But here’s what doesn’t spread hepatitis B: hugging, kissing, sharing food, using the same toilet, or being around someone who sneezes. You can’t catch it from a handshake or a cough. This myth keeps people isolated and afraid - when they shouldn’t be.

Hepatitis C spreads almost entirely through blood. It’s not passed through sex as easily - though the risk goes up if you have other STIs, are HIV-positive, or have rough sex. The biggest driver of new hepatitis C cases today? The opioid crisis. In the U.S., two-thirds of new infections are in people under 40 who inject drugs. Needle sharing, reused syringes, and even sharing straws to snort drugs can spread it. Vertical transmission - from mother to baby - happens in about 6% of pregnancies. That’s why every pregnant person should be tested.

Who Should Be Tested - And How

Testing is simple, cheap, and life-saving. For hepatitis B, doctors use a three-part blood test: HBsAg (shows current infection), anti-HBc (shows past exposure), and anti-HBs (shows immunity from vaccine or past infection). If you’re born in a country where hepatitis B is common - like Asia, Africa, or the Pacific Islands - you should be tested, even if you feel fine. The same goes for anyone who’s ever had a needlestick injury, gotten a tattoo with unsterile equipment, or had unprotected sex with someone whose status you didn’t know.

For hepatitis C, the first test checks for antibodies. If it’s positive, you need a second test - HCV RNA - to see if the virus is still active. A lot of people test positive for antibodies but have cleared the virus on their own. That’s why the second test matters. The CDC now recommends everyone get tested at least once after age 18. Pregnant people? Tested during every pregnancy. People who inject drugs? Tested every year. Even if you think you’re not at risk, you might be. Nearly half of people with hepatitis C don’t know they have it.

Point-of-care tests are making this easier. The OraQuick HCV Rapid Test gives results in 20 minutes. New hepatitis B tests can detect the virus from a finger prick with over 98% accuracy. These aren’t just for hospitals anymore - they’re being used in community centers, pharmacies, and even homeless shelters.

How Hepatitis C Is Now Curable - And Why So Few Get Treated

Before 2013, hepatitis C treatment meant 48 weeks of interferon injections, awful side effects like depression and fatigue, and only a 50% cure rate. Today? You take one pill a day for 8 to 12 weeks. No shots. No nausea. No hair loss. Cure rates? Over 95%. Drugs like Epclusa and Mavyret work for all six genotypes. They’re not just effective - they’re predictable.

So why isn’t everyone cured? Cost. In 2014, a full course of sofosbuvir cost $84,000. Today, it’s $24,000-$30,000 in the U.S. But in low-income countries, generic versions cost under $300. That gap is criminal. In Egypt, a national campaign offered free testing and $30 treatment courses. In 13 years, they cut hepatitis C from 14.7% of the population to 0.9%. That’s not science fiction - it’s policy.

In the U.S., only 21% of people with hepatitis C got treated in 2020. Why? Lack of access. Stigma. Fear of being judged for drug use. Insurance barriers. Many clinics still require you to prove you’ve stopped using drugs before they’ll treat you - even though treatment works whether you’re still using or not. That’s outdated thinking. The virus doesn’t care if you’re clean - it just wants to live.

Hepatitis B: No Cure, But Better Control

Unlike hepatitis C, hepatitis B can’t be cured yet. But it can be controlled. The goal is to keep the virus from damaging the liver. That’s done with daily pills like tenofovir alafenamide (TAF) or entecavir. These drugs suppress the virus, lower liver inflammation, and reduce the risk of cirrhosis and liver cancer. They’re safe, taken once a day, and have minimal side effects.

But you usually have to take them for life. Stopping too soon can cause the virus to flare back - sometimes with deadly results. Annual costs in the U.S. run $6,000-$12,000. That’s a barrier for many. Insurance helps, but not everyone has it. In places like Australia and Canada, these drugs are subsidized. In the U.S., patient assistance programs exist - but most people don’t know about them.

There’s hope on the horizon. New drugs in trials - like siRNA therapies and capsid modulators - are showing promise. Some are already in phase 3. One day, we might be able to turn off the virus permanently. But until then, treatment is about long-term management. And that means regular checkups, liver scans, and blood tests every six months.

Prevention: The Vaccine That Works

The hepatitis B vaccine is one of the greatest public health tools ever made. It’s been around since 1982. It’s 95% effective. It lasts for life. And yet, in the U.S., only 66.5% of adults have gotten all three doses. That’s not good enough.

The key is birth-dose vaccination. If a baby gets the first shot within 24 hours of birth - especially if the mother is infected - the chance of chronic infection drops from 90% to less than 1%. That’s why WHO recommends giving it at birth everywhere, not just in high-risk areas. In Australia, birth-dose coverage is over 90%. In the U.S., it’s under 70% in many states.

The vaccine is also given to teens, healthcare workers, people with diabetes, and anyone who’s ever been in jail or a dialysis center. It’s safe, free in many clinics, and given in three shots over six months. No one needs to be afraid of it. No one needs to wait.

What’s Next - And What’s Holding Us Back

We have the tools. We have the science. We have the drugs. What we don’t have is consistent action.

The WHO wants to cut new hepatitis infections by 90% and deaths by 65% by 2030. That’s possible - if we scale up testing, if we remove cost barriers, if we stop judging people who inject drugs, if we make the hepatitis B vaccine routine for every newborn.

In Melbourne, community health workers are going door-to-door in refugee communities to offer free hepatitis B testing. In rural Ohio, mobile clinics are treating hepatitis C in vans. In Egypt, they did it on a national scale. It’s not magic. It’s logistics. It’s willpower.

The biggest threat isn’t the virus. It’s apathy. The belief that ‘it won’t happen to me.’ That someone else’s problem isn’t mine. That we’ve already solved it. We haven’t. Not even close.

Hepatitis B and C are silent. They don’t cause pain until the liver is badly damaged. By then, it’s too late. Testing is the only way to find them early. Treatment is the only way to stop them. And prevention - the vaccine - is the only way to end it.