What are the challenges in rapidly scaling up vaccine production during a pandemic?

Influenza C virus infections generally cause mild illness and are not thought to cause human epidemics. Influenza D viruses mainly affect cows. They are not ... Four themes were identified as causes of vaccine hesitancy comprising: concerns over safety, lack of trust, lack of need for vaccination and cultural reasons. It's caused by a virus that spreads easily from person to person. Flu viruses usually cause the most illness during the colder months of the year. In the United ... What causes influenza (flu)?. The flu is caused by the influenza virus. Common classes of the virus are type A and type B. Each type includes several ... Feb 12, 2025 ... Generally, influenza viruses can infect some wild species without causing signs of disease, but new strains can emerge that cause illness with ... The flu is primarily transmitted from person to person. If someone with the flu sneezes, coughs, or talks, droplets from them become airborne. If these droplets ... What causes it? • Influenza virus. • Can be caused by a virus, bacteria, or fungi. What are the symptoms? Avian influenza (AI) is caused by influenza type A viruses that historically have spread between wild birds (waterfowl and shorebirds) with occasional ... What causes influenza? · Through the air, in droplets that an infected person spreads through a cough or sneeze · Through touching things that infected people ... Flu viruses seem to spread most predominantly through aerosol infection where people become infected because of droplets in the air that contain the virus. The ...