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Meningitis B outbreak leads a university to require the vaccine for incoming students

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CAdisease outbreakemergency notificationhigh confidence
Confirmed Threat

On September 28, 2018, the San Diego County Health and Human Services Agency declared a meningococcal disease outbreak at San Diego State University after a third case of serogroup B meningococcal disease was confirmed in an SDSU student. The university responded with mass vaccination clinics at Viejas Arena and a campuswide health advisory urging undergraduates under 24 to get one of the two licensed MenB vaccines. A fourth case in April 2019 eventually led SDSU to require MenB vaccination for all incoming students starting fall 2019.

Alerts
2
Response
—
Killed
0
Injured
4
Institution
San Diego State University
Public R2 · CA
All SDSU cases →
~35,000 studentsSDSU NewsCenter / Student Health Services
Official alert policy
Read when and how SDSU says it will use SDSU Alert: summarized, quoted, and analyzed.
Documented Timeline

Alert Sequence

2 messages in sequence · 1 verified verbatim

Confirmed wording is transcribed character-for-character from a primary source. Use Verify this quote under each message to open that source in a new tab and compare the text yourself.

Some messages in this sequence are documented (their existence, timing, and channel are sourced) but their exact wording is not preserved in the public record. Those entries appear as placeholders; only confirmed text is displayed.

INITIAL ALERTWebsite
Verified verbatim5211 chars
On Sept. 27, San Diego County Public Health Services confirmed the diagnosis of an additional case of meningococcal meningitis at San Diego State University; the student is currently undergoing treatment at a local hospital. County officials have confirmed that this case and the case confirmed in early September are both caused by serogroup B meningococcus. County public health officials on Thursday also disclosed a third confirmed case diagnosed in June. An SDSU student who was not attending classes and lived off campus was diagnosed with meningitis, also caused by the serogroup B strain. The county did not previously announce this case because there was no public health risk at the time. These three cases occurring in the SDSU undergraduate population in a 3.5-month period have been determined to be an outbreak by the San Diego County Public Health Officer. SDSU is continuing its partnership with county public health officials to monitor the outbreak. While SDSU has been active in an ongoing educational effort informing the campus community this fall about preventive vaccines and healthy habits, we are both continuing and expanding our encouragement of these means of prevention. San Diego County Public Health Services recommends that all undergraduate students under 24 years of age who have not been immunized against meningococcus B (MenB) are highly encouraged to get vaccinated with one of the two available meningococcal B vaccines (instructions are provided below). Also, please review FAQs online for details about meningitis, public health preventive measures and vaccination information: http://newscenter.sdsu.edu/sdsu_newscenter/files/09386-Meningococcal-Meningitis-FAQs-09272018.pdf Vaccinations San Diego County Public Health Services and SDSU will partner to offer vaccine clinics for undergraduate students under the age of 24. Additional information about these clinics will be available early next week. In preparation, students are encouraged to locate and review their immunization records to determine their meningococcal B immunization status. Students who would like to be immunized immediately may access the vaccine through their primary healthcare provider (learn how via SDSU Well-Being and Health Promotion) or by visiting a local pharmacy. Students are encouraged to call the pharmacy in advance to confirm the vaccine is available and that their insurance is accepted. Students may also receive the vaccine at Student Health Services for a fee. San Diego County Public Health Services currently does not recommend SDSU graduate students, faculty or staff receive the meningococcal vaccine, unless they are at increased risk, which the CDC defines online: https://www.cdc.gov/vaccines/hcp/vis/vis-statements/mening-serogroup.html What are the symptoms and how is meningitis transmitted? The bacteria (meningococcus) can be transmitted by direct contact with oral secretions, through the air via sneeze or cough droplets of respiratory secretions, or even through speaking closely face-to-face. Oral contact includes sharing items, such as cigarettes or drinking glasses, or through intimate contact such as kissing. The early symptoms usually associated with meningococcal meningitis include high fever, severe headache, stiff neck, rash, nausea, vomiting and lethargy, and may resemble the flu. Because the disease progresses rapidly, often in as little as 12 hours, prompt diagnosis and treatment are critical to recovery. You can learn more about meningococcal disease and vaccines by visiting the CDC meningococcal and Immunize.org websites: http://www.cdc.gov/meningococcal/index.html https://www.cdc.gov/meningococcal/vaccine-info.html http://www.immunize.org/vis/meningococcal_acwy.pdf What else should I do? If you are feeling ill with the symptoms noted above, please seek evaluation at an emergency department. People spread meningococcal bacteria to others by exchanging respiratory and throat secretions during close or lengthy contact. Prevention of meningococcal infection includes both specific vaccines and behaviors that help prevent the spread of meningococcus and other infectious illnesses. The most effective form of prevention is vaccination. Also, all members of the campus community are encouraged to engage in healthy habits, which lower the risk of acquiring meningococcal meningitis and many other infections. Good health habits include: Washing your hands often with soap and water. Abstaining from smoking and being around smoking. Not sharing cups and other utensils; food and beverages; or makeup and lip balm. Eating healthy, nutritious foods and drinking plenty of fluids. Exercising, managing stress with healthy coping strategies and getting plenty of quality sleep. Covering your mouth and nose with a tissue or a sleeve (not your hand) when coughing or sneezing. Please engage in these good health habits, and also take proper rest and seek appropriate medical care when ill. If you have questions, call Student Health Services at 619-594-4325. As a reminder, Student Health Services offers a nurse advice hotline via 858-225-3105 after 4:30 p.m., Monday-Friday, and on weekends and SDSU holidays.
The third case is what triggered the formal outbreak declaration under CDC criteria for university-associated meningococcal disease
Specifies both available MenB vaccines (Bexsero and Trumenba) without naming brands, mirroring official phrasing
Supervisor rule-0 audit (2026-07-18): demoted from isVerbatimConfirmed:true -- the text blends language from two separate source documents (an SDSU NewsCenter page and a distinct San Diego County News Center announcement) and includes an editorial 'The following message was sent to students, faculty and staff.' preamble that marks it as article prose surrounding a message rather than an isolated transmitted alert transcribed verbatim from one source.
Alert-ness audit 2026-07-20: demoted to isVerbatimConfirmed:false -- the transcribed text is SDSU NewsCenter article prose (opening third-person paragraphs plus the editorial 'The following message was sent to students, faculty and staff' preamble) that frames and blends a message rather than a verbatim capture of one isolated transmitted email/SMS to the community.
Lane B flip 2026-10-12: answers the 2026-07-18 rule-0 and 2026-07-20 alert-ness audits. The SDSU NewsCenter page embeds the campus message under the editorial line 'The following message was sent to students, faculty and staff.' Dual BeautifulSoup and stdlib HTMLParser reads of the message blocks (paragraphs, h2 headings, and list items after that marker) match (5,211 chars). The newsroom framing above the marker (the third-person opening paragraphs and the editorial preamble itself) is excluded; only the sent message is confirmed. The prior committed text had blended that framing with a truncated copy of the message; it is replaced. Headings ('Vaccinations', 'What are the symptoms and how is meningitis transmitted?', 'What else should I do?'), the three CDC/Immunize.org URLs, and the six healthy-habits list items that the prior text dropped are restored. Link text kept as published (FAQ URL as its own http:// link text; 'increased risk' as link text; the CDC URL that follows as its own link text). Channel left as website: the NewsCenter page is the capture; the page states the message was sent to students, faculty and staff but does not name the delivery path. The two demote annotations are kept as history.
UPDATEWebsite
Wording not yet recovered

A message was sent at this point in the sequence; its exact wording has not yet been recovered from the official record, so no text is shown. This site never paraphrases or reconstructs alert wording. Markers like this one keep the emergency's true shape and become word-for-word messages as recovery reaches the source.

Reconstructed from San Diego County Public Health outbreak situation page and SDSU updates
Message elements

How the first alert is built

To check this alert, an AI model read it in full 25 separate times, independently. Each read decided whether the message answers each of the six questions and gave a short reason. A final reviewer then weighed all 25 and wrote the plain-English verdict you see when you open a row. The score (for example 22/25) is how many reads agreed; the 25 individual reads are tucked underneath if you want to check them.

On Sept. 27, San Diego County Public Health Services confirmed the diagnosis of an additional case of meningococcal meningitis at San Diego State University; the student is currently undergoing treatment at a local hospital. County officials have confirmed that this case and the case confirmed in early September are both caused by serogroup B meningococcus. County public health officials on Thursday also disclosed a third confirmed case diagnosed in June. An SDSU student who was not attending classes and lived off campus was diagnosed with meningitis, also caused by the serogroup B strain. The county did not previously announce this case because there was no public health risk at the time. These three cases occurring in the SDSU undergraduate population in a 3.5-month period have been determined to be an outbreak by the San Diego County Public Health Officer. SDSU is continuing its partnership with county public health officials to monitor the outbreak. While SDSU has been active in an ongoing educational effort informing the campus community this fall about preventive vaccines and healthy habits, we are both continuing and expanding our encouragement of these means of prevention. San Diego County Public Health Services recommends that all undergraduate students under 24 years of age who have not been immunized against meningococcus B (MenB) are highly encouraged to get vaccinated with one of the two available meningococcal B vaccines (instructions are provided below). Also, please review FAQs online for details about meningitis, public health preventive measures and vaccination information: http://newscenter.sdsu.edu/sdsu_newscenter/files/09386-Meningococcal-Meningitis-FAQs-09272018.pdf Vaccinations San Diego County Public Health Services and SDSU will partner to offer vaccine clinics for undergraduate students under the age of 24. Additional information about these clinics will be available early next week. In preparation, students are encouraged to locate and review their immunization records to determine their meningococcal B immunization status. Students who would like to be immunized immediately may access the vaccine through their primary healthcare provider (learn how via SDSU Well-Being and Health Promotion) or by visiting a local pharmacy. Students are encouraged to call the pharmacy in advance to confirm the vaccine is available and that their insurance is accepted. Students may also receive the vaccine at Student Health Services for a fee. San Diego County Public Health Services currently does not recommend SDSU graduate students, faculty or staff receive the meningococcal vaccine, unless they are at increased risk, which the CDC defines online: https://www.cdc.gov/vaccines/hcp/vis/vis-statements/mening-serogroup.html What are the symptoms and how is meningitis transmitted? The bacteria (meningococcus) can be transmitted by direct contact with oral secretions, through the air via sneeze or cough droplets of respiratory secretions, or even through speaking closely face-to-face. Oral contact includes sharing items, such as cigarettes or drinking glasses, or through intimate contact such as kissing. The early symptoms usually associated with meningococcal meningitis include high fever, severe headache, stiff neck, rash, nausea, vomiting and lethargy, and may resemble the flu. Because the disease progresses rapidly, often in as little as 12 hours, prompt diagnosis and treatment are critical to recovery. You can learn more about meningococcal disease and vaccines by visiting the CDC meningococcal and Immunize.org websites: http://www.cdc.gov/meningococcal/index.html https://www.cdc.gov/meningococcal/vaccine-info.html http://www.immunize.org/vis/meningococcal_acwy.pdf What else should I do? If you are feeling ill with the symptoms noted above, please seek evaluation at an emergency department. People spread meningococcal bacteria to others by exchanging respiratory and throat secretions during close or lengthy contact. Prevention of meningococcal infection includes both specific vaccines and behaviors that help prevent the spread of meningococcus and other infectious illnesses. The most effective form of prevention is vaccination. Also, all members of the campus community are encouraged to engage in healthy habits, which lower the risk of acquiring meningococcal meningitis and many other infections. Good health habits include: Washing your hands often with soap and water. Abstaining from smoking and being around smoking. Not sharing cups and other utensils; food and beverages; or makeup and lip balm. Eating healthy, nutritious foods and drinking plenty of fluids. Exercising, managing stress with healthy coping strategies and getting plenty of quality sleep. Covering your mouth and nose with a tissue or a sleeve (not your hand) when coughing or sneezing. Please engage in these good health habits, and also take proper rest and seek appropriate medical care when ill. If you have questions, call Student Health Services at 619-594-4325. As a reminder, Student Health Services offers a nurse advice hotline via 858-225-3105 after 4:30 p.m., Monday-Friday, and on weekends and SDSU holidays.

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  • Hazardabsent0/0

    What the threat actually is. A complete warning names the specific danger, such as a shooter, a fire, a tornado, or a gas leak, rather than a vague emergency, because people decide what to do based on what they are facing.

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  • Locationabsent0/0

    Where the threat is. Saying whether danger is in a specific building, a part of campus, or area-wide lets people judge their own proximity and choose a safe direction. Without a where, a warning is hard to act on precisely.

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  • Guidanceabsent0/0

    The protective action to take. A clear, specific instruction, such as shelter in place, evacuate, avoid the area, or run-hide-fight, drives faster and more correct protective behavior than describing the threat alone.

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    What the hazard could do to the people in its path. Beyond naming the threat, a complete warning conveys its potential consequences or severity, such as that a tornado can level buildings or that a leak could be explosive, so recipients grasp how much danger they are in. Research on warning message content finds that a concrete impact statement helps people personalize their risk and act sooner.

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Systematic AI judgments with visible reasoning, not human-validated codings.

About this analysis
Context

Background

San Diego State University's 2018-2019 meningococcal B outbreak was one of the most consequential university-based MenB outbreaks of the decade because it produced a permanent vaccine policy change. The outbreak began with two cases in summer 2018 and was formally declared on September 28, 2018 when a third SDSU student was diagnosed with serogroup B meningococcal disease. Under CDC guidance, three or more cases of the same serogroup at a single institution within a defined period meets the threshold for an outbreak declaration, which then unlocks expanded recommendations for vaccination of the at-risk population. SDSU and the San Diego County Health and Human Services Agency responded by hosting mass vaccination clinics at Viejas Arena, the campus's basketball arena, in October 2018. UCSD's Student Health Services warned its own students about the SDSU outbreak given the high level of social mixing between San Diego campuses. A fourth case was confirmed in April 2019, prompting SDSU to announce (in May 2019) that all incoming students starting fall 2019 would be required to be fully vaccinated against meningococcal serogroup B as a condition of enrollment, making SDSU one of the first U.S. universities to mandate MenB vaccination. By the conclusion of the response, approximately 9,000 SDSU students had received at least one MenB dose. The outbreak followed a recognized national pattern of serogroup B meningococcal outbreaks on U.S. college campuses between 2013 and 2018, including outbreaks at Princeton, UCSB, the University of Oregon, and Oregon State University.
Analysis

Key Findings

The outbreak was formally declared on September 28, 2018 after the third confirmed case at SDSU within a defined period
SDSU held mass vaccination clinics at Viejas Arena on October 5 and 8, 2018, vaccinating roughly 9,000 students over the response period
A fourth case in April 2019 prompted SDSU to mandate MenB vaccination for all incoming students starting fall 2019
The case fits the pattern of 10+ U.S. university MenB outbreaks documented by CDC between 2013 and 2018
Outcome
Three SDSU students were hospitalized in 2018 and a fourth in April 2019. No SDSU students died. By the end of the outbreak response, approximately 9,000 students had received at least one MenB vaccine dose, and SDSU announced a mandatory MenB vaccine requirement for incoming students.
Provenance

Sources

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Cite this case

Campus Alert Archive. "San Diego State University: Meningitis B outbreak leads a university to require the vaccine for incoming students." Incident of September 28, 2018. Added May 2026; last updated October 2026. https://campusalertarchive.com/case/san-diego-state-university-meningitis-b-outbreak-2018-09-28/

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Tags
meningitismeningococcal-bdisease-outbreakpublic-healthvaccinationsan-diego-statecaliforniavaccine-mandateviejas-arena
Added May 2026Updated October 2026Via ingestion