I am a medical microbiologist, and have been since 1974. There are many different types of streptococcus infections. Uben, I have no doubt your wife was infected with Group A Beta strep (see below). However, it is not called scarlet fever when it is invasive like that. Scarlet fever is a sequel to pharyngitis (sore throat) and presents as a rash (see below). Sometimes invasive Group A infections coexist with Staphylococcus aureus/MRSA infections. That's a much too complicated topic to approach in this message.
Streptococcus pneumonia can cause bacterial pneumonia (as can other organisms). It can be lethal very quickly. It can cause a consolidated mass in the lung. It can be treated with antibiotics. This organism used to be universally sensitive to Penicillin, but nowadays there are more resistant strains around. When one gets a pneumonia vaccine, this is the organism you are hopefully protected against. This bug is the most common cause of bacterial pneumonia and, in patients over the age of 60, it can kill 20% of its victims. If you rapidly spike a high temp and/or cough up blood from an upper respiratory infection, get your butt to an ER quickly. Waiting does NOT improve your chances of a good outcome. You can end up in ICU with this one. It can also migrate to your spinal fluid and cause meningitis. It can kill you quickly from there. Antibiotics can help IF you get them fast. These bacteria produce toxins. If the toxins get ahold of you, all the antibiotics in the world will not help.
http://www.textbookofbacteriology.net/S.pneumoniae.htmlStreptococcus pyogenes (also known as Group A Beta strep) can cause many infections. It is the organism one worries about when you get strep throat, but is also the organism referred to in cases of "flesh-eating" infections.
http://www.textbookofbacteriology.net/streptococcus.html"In the last century, infections by S. pyogenes claimed many lives especially since the organism was the most important cause of puerperal fever (sepsis after childbirth). Scarlet fever was formerly a severe complication of streptococcal infection, but now, because of antibiotic therapy, it is little more than streptococcal pharyngitis accompanied by rash. Similarly, erysipelas (a form of cellulitis accompanied by fever and systemic toxicity) is less common today. However, there has been a recent increase in variety, severity and sequelae of Streptococcus pyogenes infections, and a resurgence of severe invasive infections, prompting descriptions of "flesh eating bacteria" in the news media. A complete explanation for the decline and resurgence is not known. Today, the pathogen is of major concern because of the occasional cases of rapidly progressive disease and because of the small risk of serious sequelae in untreated infections. These diseases remain a major worldwide health concern, and effort is being directed toward clarifying the risk and mechanisms of these sequelae and identifying rheumatogenic and nephritogenic strains of streptococci.
Acute Streptococcus pyogenes infections may present as pharyngitis (strep throat), scarlet fever (rash), impetigo (infection of the superficial layers of the skin) or cellulitis (infection of the deep layers of the skin). Invasive, toxigenic infections can result in necrotizing fasciitis, myositis and streptococcal toxic shock syndrome. Patients may also develop immune-mediated post-streptococcal sequelae, such as acute rheumatic fever and acute glomerulonephritis, following acute infections caused by Streptococcus pyogenes."
There are other types of strep infections also but these are the two biggies. I wish, when news media make these blanket statements about strep possibly causing the 1918 pandemic, they would be clearer in telling us what KIND of strep they are referring to. There are lots of them. Strains of these bugs have different virulence factors. Systemic infections (blood, spinal fluid) from these organisms are reported to state Health departments and ultimately the CDC.
Anyone wishing to track the country's infections can go to the MMWR report from the CDC. You can enter your email address and get a weekly report by state and county for free. This is something your tax dollars pay for that's NOT a tax boondoggle and IS a good thing.
http://www.cdc.gov/mmwr/Lots of statistics available too, if you're into those:
http://www.cdc.gov/mmwr/preview/mmwrhtml/mm5804md.htmI will be glad to explain any microbiology questions any time. Unfortunately, micro is a difficult subject to understand, and there are lots of myths and untruths out there. I have been reporting out microbiology lab reports my entire adult career. I and my colleagues in labs across the country SEND OUT the lab report your docs get when you are sick and have a culture submitted. We do this 365 days a year.