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Smallpox and Mpox Vaccine, Live, Nonreplicating
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General Dosing Information
0.5 mL subcutaneously for 2 doses administered 4 weeks apart.[64646]
0.5 mL subcutaneously for 2 doses administered 4 weeks apart.[67840]
0.1 mL intradermally for 2 doses administered 4 weeks apart.[67840]
0.5 mL subcutaneously for 2 doses administered 4 weeks apart. Administer within 4 days from exposure date to prevent onset of disease. If administered between 4 and 14 days after exposure, vaccination may reduce symptoms of disease, but not prevent disease. If it has been more than 3 years since vaccination, consider revaccinating.[64646] [67650]
Prior to dosing, contact jurisdictional health department to assist in consultation with CDC for guidance. 0.5 mL subcutaneously for 2 doses administered 4 weeks apart. Administer within 4 days from exposure date to prevent onset of disease. If administered between 4 and 14 days after exposure, vaccination may reduce symptoms of disease, but not prevent disease.[67654] [67802] [67840]
Prior to dosing, contact jurisdictional health department to assist in consultation with CDC for guidance. 0.5 mL subcutaneously for 2 doses administered 4 weeks apart. Administer within 4 days from exposure date to prevent onset of disease. If administered between 4 and 14 days after exposure, vaccination may reduce symptoms of disease, but not prevent disease. Due to an immature immune system and possible decreased vaccine response, immune globulin or antivirals may also be considered.[67802] [67654] [67840]
0.1 mL intradermally for 2 doses administered 4 weeks apart. Administer within 4 days from exposure date to prevent onset of disease. If administered between 4 and 14 days after exposure, vaccination may reduce symptoms of disease, but not prevent disease. If it has been more than 3 years since vaccination, consider revaccinating.[67650] [67840] [67847]
0.5 mL subcutaneously for 2 doses administered 4 weeks apart.[64646]
0.5 mL/dose subcutaneous; 0.1 mL/dose intradermal.
0.5 mL/dose subcutaneous; 0.1 mL/dose intradermal.
0.5 mL/dose subcutaneous.
0.5 mL/dose subcutaneous.
0.5 mL/dose subcutaneous.
Safety and efficacy have not been established.
Specific guidelines for dosage adjustments in hepatic impairment are not available; it appears that no dosage adjustments are needed.
Specific guidelines for dosage adjustments in renal impairment are not available; it appears that no dosage adjustments are needed.
† Off-label indicationSmallpox and monkeypox vaccine, live, nonreplicating is used for the prevention of smallpox and monkeypox (mpox) infection in high risk patients. It is FDA-approved for subcutaneous injection in patients 18 years and older; subcutaneous injection in patients younger than 18 years of age and intradermal injection in patients 18 years and older is covered under an Emergency Use Authorization (EUA). Full vaccination requires 2 doses; however, some protection may be gained at least 14 days after the first dose. During sensitivity analysis the average incidence rate ratio (IRR), calculated by dividing the weighted average incidence among unvaccinated patients by that among patients who received 1 dose of vaccine 14 days or more prior, was 14.3 (95% CI = 5 to 41). Although a single dose may provide some protection against monkeypox (mpox) infection, the durability of immunity after a single dose is unknown; it is recommended that eligible patients complete the 2-dose series. Smallpox and monkeypox vaccine, live, nonreplicating does not contain the viruses that cause smallpox or monkeypox (mpox), but instead is made from a vaccinia virus. Vaccinia virus is antigenically similar to the variola virus, which causes smallpox, and to the monkeypox virus (mpox). It contains a modified form of the vaccinia virus called Modified Vaccinia Ankara, which is nonreplicating and does not cause disease in humans. Using a modified form of the vaccinia allows people with pre-existing conditions such as immune system disorders to receive the vaccine; however, they may have a diminished immune response. The smallpox and monkeypox vaccine, live, nonreplicating has several advantages compared to the smallpox vaccine. The smallpox and monkeypox vaccine, live, nonreplicating has fewer contraindications, no risk for inadvertent inoculation and autoinoculation, and is associated with less serious adverse reactions compared to the smallpox vaccine. Additionally, most health care providers have more experience administering a subcutaneous vaccine compared to a percutaneous vaccine. In the United States, routine vaccination of the public against smallpox ended in 1972. The level of immunity, if any, among persons who were vaccinated before 1972 is uncertain, therefore, it is assumed that these persons are susceptible to smallpox. The effectiveness of the smallpox and monkeypox vaccine, live, nonreplicating for the prevention of smallpox was found to be not inferior to the FDA-approved vaccine for the prevention of smallpox in a study of approximately 400 healthy adults. The effectiveness of the smallpox and monkeypox vaccine, live, nonreplicating for the prevention of monkeypox (mpox) infection was inferred from the antibody responses in the smallpox clinical study patients and from studies in nonhuman primates. The vaccine safety was assessed in more than 7,800 patients who received at least 1 dose of the vaccine. Injection site reactions, muscle pain, headache, and fatigue were the most commonly reported adverse reactions. Smallpox and monkeypox vaccine, live, nonreplicating is a 2-dose series administered 4 weeks apart. Full vaccine protection is not present until 2 weeks after administration of the second dose.[64646][64667][67763][67840][68022]
For storage information, see the specific product information within the How Supplied section.
Intradermal Injection
Injection site reaction is one of the most common adverse reactions associated with smallpox and monkeypox vaccine, live, nonreplicating. Pain (84.9%; grade 3 7.4%), erythema (60.8%; redness of at least 100 mm 1.5%), swelling (51.6%; swelling of at least 100 mm 0.8%), induration (45.4%; induration of at least 100 mm 0.3%), and pruritus (43.1%; grade 3 1.6%) were reported in patients receiving smallpox and monkeypox vaccine, live, nonreplicating during a clinical trial. Most solicited local and systemic adverse reactions reported after vaccination had a median duration of 1 to 6 days. There were similar proportions of patients reporting solicited local or systemic reactions of any severity after Dose 2 compared with Dose 1, with the exception of injection site pain. The incidence of injection site pain was higher with the first dose (79.3%) compared to dose 2 (69.9%). In 3 studies (n = 409) involving patients who had previously been vaccinated with a smallpox vaccine, erythema (80.9%), pain (79.5%), induration (70.4%), swelling (67.2%), and pruritus (32%) were reported. In patients with active or a history of atopic dermatitis (AD), erythema was reported in 61.2% of patients with AD vs. 49.3% without AD and swelling was reported in 52.2% of patients with AD vs. 40.8% without AD. Hypersensitive reactions including angioedema, rash, and urticaria have been reported during postmarketing use of the smallpox and monkeypox vaccine, live, nonreplicating. Injection site warmth and injection site vesicles have also been reported during postmarketing use.[64646]
Muscle pain (42.8%; grade 3 2.6%), headache (34.8%; grade 3 2.4%), and fatigue (30.4%; grade 3 3%) were reported in patients receiving smallpox and monkeypox vaccine, live, nonreplicating during a clinical trial. In 3 studies (n = 409) involving patients who had previously been vaccinated with a smallpox vaccine, fatigue (33.5%), headache (27.6%), and muscle pain (21.5%) were reported. In patients with active or a history of atopic dermatitis (AD), headache was reported in 47.2% of patients with AD vs. 34.8% without AD.[64646]
Nausea (17.3%; grade 3 1.5%) was reported in patients receiving smallpox and monkeypox vaccine, live, nonreplicating during a clinical trial. In 3 studies (n = 409) involving patients who had previously been vaccinated with a smallpox vaccine, nausea was reported in 9.8% of patients.[64646]
Chills (10.4%; grade 3 1%) and fever (1.7%; grade 3 0.2%) were reported in patients receiving smallpox and monkeypox vaccine, live, nonreplicating during a clinical trial. In 3 studies (n = 409) involving patients who had previously been vaccinated with a smallpox vaccine, chills (0.7%) and fever (0.5%) were reported. In HIV-infected patients with previous smallpox vaccine exposure, fever (1.5%) and chills (8.4%) were reported. The frequency of other solicited local and general adverse reactions in this population were similar to those reported in non-HIV-infected patients who had previously received smallpox vaccination. HIV-infected patients who had not received the smallpox vaccine had solicited local and systemic adverse reactions at similar or lower frequencies as compared to those in non-HIV-infected patients. In patients with active or a history of atopic dermatitis (AD), chills were reported in 15.9% of patients with AD vs. 7.8% without AD.[64646]
Smallpox and monkeypox vaccine, live, nonreplicating recipients were monitored for cardiac-related signs or symptoms through at least 6 months after the last vaccination. Cardiac adverse events were reported in 1.3% (95/7,093) of vaccine recipients and 0.2% (3/1,206) of placebo recipients who were smallpox vaccine-naive. Cardiac adverse events were reported in 2.1% (16/766) of vaccine recipients who were smallpox vaccine-experienced. The higher number of patients who experienced cardiac adverse events was driven by 28 cases of asymptomatic post-vaccination elevation of troponin-I above 2 times the upper limit of normal (ULN) in 2 studies, 1 which enrolled HIV-infected patients and 1 which enrolled patients with atopic dermatitis. An additional 127 cases of asymptomatic post-vaccination elevation of troponin-I above the ULN, but not above 2 times the ULN, were documented in smallpox and monkeypox vaccine, live, nonreplicating recipients, 124 of which occurred in trials which enrolled HIV-infected patients and patients with atopic dermatitis. The clinical significance of the asymptomatic post-vaccination elevations of troponin-I is unknown. Among the cardiac adverse events reported, 6 cases (0.08%) were considered to be causally related to smallpox and monkeypox vaccine, live, nonreplicating vaccination and included sinus tachycardia, electrocardiogram T wave inversion, abnormal electrocardiogram, electrocardiogram ST segment elevation, abnormal electrocardiogram T wave, and palpitations. None of the cardiac adverse events were considered serious. Myocarditis and pericarditis have been reported during postmarketing use of the smallpox and monkeypox vaccine, live, nonreplicating.[64646]
Dizziness, syncope, and facial paralysis (Bell's palsy) have been reported during postmarketing use of the smallpox and monkeypox vaccine, live, nonreplicating.[64646]
Patients suffering significant immunosuppression may have a diminished immune response to vaccination with smallpox and monkeypox vaccine, live, nonreplicating.[64646] [67840] Immunosuppressed persons may include patients with acquired immunodeficiency syndrome (AIDS); asymptomatic or symptomatic human immunodeficiency virus (HIV) infection; severe combined immunodeficiency (SCID); hypogammaglobulinemia; agammaglobulinemia; altered immune states due to diseases such as leukemia, lymphoma, or generalized neoplastic disease; or an immune system compromised by corticosteroid therapy with greater than physiologic doses, alkylating drugs, antimetabolites, or radiation therapy. Short-term (less than 2 weeks) corticosteroid therapy or intra-articular, bursal, or tendon injections with corticosteroids should not be immunosuppressive.[65107]
Data on administration of smallpox and monkeypox vaccine, live, nonreplicating during human pregnancy are not available; however, animal data have not identified a vaccine associated risk of fetal harm. A single human dose of smallpox and monkeypox vaccine, live, nonreplicating in female rats and rabbits on 2 or 3 different occasions (prior to mating, and on gestation days 0 and 14) showed no vaccine-related fetal malformations or variations and no adverse effects on female fertility or pre-weaning development.[64646]
There are no data on the presence of the smallpox and monkeypox vaccine, live, nonreplicating in human milk, the effects on a breast-fed infant, or the effects on milk production.[64646] Consider the benefits of breast-feeding, the risk of potential infant drug exposure, and the risk of an untreated or inadequately treated condition. If a breast-feeding infant experiences an adverse effect related to a maternally administered drug, healthcare providers are encouraged to report the adverse effect to the FDA.
The smallpox and monkeypox vaccine, live, nonreplicating is indicated for subcutaneous and intradermal administration; do not give via intravenous administration or intramuscular administration. Incorrect administration may result in inadequate immunity.[64646] [67840]
The smallpox and monkeypox vaccine, live, nonreplicating is contraindicated in patients with a history of a severe allergic reaction after a previous dose of smallpox and monkeypox vaccine, live, nonreplicating. These patients should not be vaccinated; consider referral to an allergist-immunologist to assess the risks versus benefits of administering a dose. Use caution when administering to patients with a history of severe allergic reaction to gentamicin, ciprofloxacin, or in patients with an egg hypersensitivity; the vaccine contains small amounts of gentamicin and ciprofloxacin and is produced using chicken embryo fibroblast cells. Discuss the risks and benefits of vaccination with the patient. If vaccinated, observe for 30 minutes after administration. Alternatively, vaccination can be delayed until an allergist-immunologist is consulted; consider the impact of delaying vaccination. If an anaphylactic or other clinically significant hypersensitivity reaction occurs, institute appropriate therapy.[67847]
Consider deferring vaccination with the smallpox and monkeypox vaccine, live, nonreplicating in patients with moderate to severe acute illness, with or without fever, until acute illness has improved.[67847]
Syncope or fainting has been reported following the administration of the smallpox and monkeypox vaccine, live, nonreplicating. Procedures should be in place to avoid injury from fainting.[64646]
The smallpox and monkeypox vaccine is an attenuated, live, nonreplicating vaccine that elicits humoral and cellular immune responses to orthopoxviruses. Vaccinia neutralizing antibody responses in humans were evaluated to establish vaccine effectiveness for prevention of smallpox and monkeypox (mpox).[64646]
Revision Date: 11/26/2024, 11:36:45 AMThe smallpox and monkeypox vaccine, live, nonreplicating is administered subcutaneously and intradermally.[64646][67840]
The geometric mean titer (GMT) of vaccinia neutralizing antibodies assessed by plaque reduction neutralization test (PRNT) 2 weeks after the second dose of smallpox and monkeypox vaccine, live, nonreplicating in smallpox vaccine naive adults was 152.8 compared to 10.1 prevaccination. The GMT of neutralizing antibodies 4 weeks after a single dose of a licensed smallpox vaccine was 84.4 compared to 10 prevaccination. The GMTs at 2 and 4 weeks after the first dose of smallpox and monkeypox vaccine were 23.4 and 23.5, respectively.[64646][67840]
Intradermal administration
In a clinical study, patients were randomized to receive 2 intradermal 0.1 mL doses (n = 191) or 2 subcutaneous 0.5 mL doses (n = 167) of smallpox and monkeypox vaccine, live, nonreplicating administered 4 weeks apart. Using 4 different assays to evaluate immunogenicity, the development of the immune response to smallpox and monkeypox vaccine, live, nonreplicating over time after subcutaneous and intradermal administration was nearly identical, and the log2 transformed peak titers obtained after intradermal administration were non-inferior to those obtained after subcutaneous administration.[67840]
Data on administration of smallpox and monkeypox vaccine, live, nonreplicating during human pregnancy are not available; however, animal data have not identified a vaccine associated risk of fetal harm. A single human dose of smallpox and monkeypox vaccine, live, nonreplicating in female rats and rabbits on 2 or 3 different occasions (prior to mating, and on gestation days 0 and 14) showed no vaccine-related fetal malformations or variations and no adverse effects on female fertility or pre-weaning development.[64646]
There are no data on the presence of the smallpox and monkeypox vaccine, live, nonreplicating in human milk, the effects on a breast-fed infant, or the effects on milk production.[64646] Consider the benefits of breast-feeding, the risk of potential infant drug exposure, and the risk of an untreated or inadequately treated condition. If a breast-feeding infant experiences an adverse effect related to a maternally administered drug, healthcare providers are encouraged to report the adverse effect to the FDA.
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