Ask HN: Why UNICEF is giving tetanus shots to young women

I received this morning a voice message from my 20 years old sister, and from her voice and message, she is clearly worried. A couple of days ago she received a vaccination at school from agents of Unicef, a tetanus vaccine supposedly. The vaccine was only administered to females aged 15 and higher. Her school is not the first one, tens of thousands of young women are receiving these shots for reasons unclear. I am not suggesting that there is anything wrong, but it's really curious to me that a tetanus vaccine would only benefit women? These shots are being administered without any parental consent to teenagers without any explanations. This is clearly wrong and shocking. This makes me realize that due process is only relevant for these NGOs if you live in countries where citizens are properly represented. I am writing this to try and see if anyone here has a good understanding of tetanus and could help understand. Why would a tetanus shot be only administered to young women? I have always been myself an advocate for vaccination and know for a fact that most conspiracy theories are just that, theories. I would love to be able to call my sister and as usual, tell her that she shouldn't believe everything she reads on the internet. Why I am posting this here? HN is one of the most diverse fora in terms of background, and I believe, having been a reader for a decade, that most people here care about the truth, and spreading it. For obvious reasons, I am posting this from a newly created account.