The organization seeks to encourage more teens to get vaccinated, and Hale is dedicating herself and offering her celebrity status as a platform to educate as many people as she can.

Meningococcal meningitis, a type of bacterial infection, is spread from person to person through respiratory and throat secretions.

The Centers for Disease Control and Prevention (CDC) reported less than 1,000 cases in the U.S. from year to year, but the infection can kill a patient in a day.  

"I'm very aware of who supports me and who my fan base is, and that's teens," the 25-year-old told People Magazine. "Teens are the ones that are at risk here. Oftentimes, I don't get to lend my voice to something that can change a life. Although it's a rare disease, it's one too many. It's always one too many." 

Young people are the most vulnerable, but why?

Their behaviors, according to Sally Schoessler from the National Association of School Nurses.

"It's sharing eating utensils, sharing water bottles, kissing, living in close corporate quarters like dormitories or even camps," she told People. "It's difficult to diagnose because it looks like the flu, but it can take the life of an otherwise healthy individual within 24 hours."

Kids should get vaccinated at age 11 or 12, but an alarming statistic revealed that under 30 percent of children ages 13-17 actually received the second booster shot a few years later (even though close to 80 percent got the initial dose).

"To think that, within a day, the disease can attack otherwise healthy teens, causing them to lose their hearing, limbs or, even worse, die - it's terrifying. I want to do anything I can to help moms protect their teens from what is a vaccine-preventable disease," Hale expressed.

For Hale's partnership with Voices of Meningitis for its "Boost the Volume" campaign, high school a capella groups from Los Angeles, New York, Philadelphia and Oregon will be challenged to sing a mashup of "Best Day of My Life" by American Authors and "Good Life" by One Republic. The groups will compete for a chance to sing with Hale.

"A capella groups are very appropriate right now with 'Pitch Perfect' and 'Glee.' I was never part of an a cappella group, so this is fulfilling something on my bucket list," she joked. "I was like, 'Am I too old to be in a high school a capella group?' 

"But it's very fun. And the whole foundation of all of this is spreading awareness about meningococcal meningitis, and I think we can really make a difference here. I'm just overjoyed that I get to be the person that gets to talk and sing about it."