Bacteriophages are viruses that attack and infect bacteria.
While some viruses make us sick, others can fight against bacteria, or protect us from more harmful viruses.
The vaccine coverage needed for herd immunity varies from disease to disease.
When a certain percentage of a population has been vaccinated, it prevents an infectious disease from spreading. But that threshold depends on the disease.
You might feel terrible. But your runny nose, sore throat and aches are signs your body is fighting the flu virus. And that’s a good thing.
How can a tiny flu virus make you feel so bad, all over? Here's what's behind your high temperature, muscle aches and other flu symptoms.
Children report being at their happiest when playing outside.
Adults must let go of their fears of injury and kidnapping. Children need free outdoor play to build physical immunity, psychological health, executive functioning and social skills.
If a Canadian health-care professional believes that an adolescent is a mature minor and has not been vaccinated, they are legally and ethically obliged to provide them with information about vaccination.
In Canada, the age of consent for health-care decisions is assessed on a case-by-case basis. It can be age 14, or sometimes even younger.
Several parents do not want their children vaccinated, for religious or other reasons.
Measles cases in the US have reached their highest in 25 years. A bioethicist argues why parents opposed to vaccination are not just wrong about the science, but about the morals.
Vaccine work because they help create herd immunity.
Billboards spreading misinformation on the risks of vaccination have popped up around American cities. A bioethicist explains why decisions not to vaccinate children are indefensible.
U.S. President Donald Trump during a campaign rally in Topeka, Kan., Oct. 6, 2018.
US law says the president can't be indicted, an echo of ancient Roman law. The efforts Roman leader Julius Caesar made to maintain his immunity is a cautionary tale for America's political system.
The immune system has to establish which cells belong to us and which are foreign, no mean feat.
Nobel laureate Peter Doherty explains immunity.
An increasingly mobile global population is making it easier for infectious diseases to spread.
Travel allows us to see the world – and bring foreign diseases home. Here's why spreading disease is easier than ever.
Isolated peoples’ immune systems haven’t learned how to resist bugs.
There are numerous examples of the havoc infectious diseases can play on communities that have not previously been exposed to them.
The flu shot is free for at-risk groups, and available to others for around $10-$25.
While not perfect, the seasonal flu vaccine is the best way to protect against influenza. There are a few changes to the flu vaccine and what is available this year. Here's what you need to know.
Young children catch and spread the flu more than any other age group.
The flu vaccine isn't perfect but it's the best way to protect against these potentially harmful viruses. Most children aged six months to five years are eligible for a free vaccine in 2018.
A line of AR-15s are on display at gunmaker Daniel Defense in Georgia.
AP Photo/Lisa Marie Pane
The gun industry has been virtually immune from liability for the deaths and injuries caused by its products since 2005. Can this change?
Could the yearly flu shot become a thing of the past?
AP Photo/Darron Cummings, File
Flu virus mutates so quickly that one year's vaccine won't work on the next year's common strains. But rational design – a new way to create vaccines – might pave the way for more lasting solutions.
It's still unclear whether Zimbabwe will manage an effective transition to participatory democracy and freedom. And the current signs are not encouraging.
Using the right metaphor in science is important.
Parents are concerned combination vaccines, which protect against several diseases at once, can be too much for a young immune system to cope with.
Vaccines against multiple diseases in one jab strengthen kids' immune systems, not weaken them. Here's why we shouldn't fear these combination vaccines.
It’s the ability of our immune system to remember past infections, and pass this memory on to our kids, that allows us to survive infectious diseases.
With so many microbes capable of hijacking and destroying us, how are we, as a species, still enduring?
What if it wasn’t back to the drawing board every year for a new flu shot?
Flu virus mutates so quickly that one year's vaccine won't work on the next year's common strains. But a new way to create vaccines, called 'rational design,' might pave the way for more lasting solutions.